EPLAN P8 — PLC, SCADA, DCS, IT & Server Panel Designation Reference Guide
| Specialized for: PLC Panels | SCADA Systems | DCS Cabinets | Safety Controllers (SIS/ESD) | RTU Panels | Marshalling Cabinets | Server Racks | Network Cabinets | Comms Panels | Historian Servers | HMI Stations | Engineering Workstations | Patch Panels | KVM Systems |
Table of Contents
- Fundamentals
- Naming Philosophy for Automation & IT
- PLC Panel — Small (Standalone Machine / Process)
- PLC Panel — Medium (Multi-Rack / Remote I/O)
- PLC Panel — Large (Redundant CPU / High Availability)
- Remote I/O Cabinets & Field Panels
- Safety PLC / Safety Controller (SIS / ESD)
- DCS — Distributed Control System
- SCADA System Panels
- RTU — Remote Terminal Unit Panels
- Marshalling Cabinets (Automation-Focused)
- Instrumentation Cabinets (Loop-Powered)
- HMI Stations & Operator Consoles
- Engineering Workstation Panels
- Historian & Application Server Racks
- Network Infrastructure Cabinets
- Industrial Network Cabinets (OT Network)
- IT / Corporate Network Racks (IT Network)
- Server Racks & Blade Centres
- Storage & Backup Systems
- KVM & Console Access Systems
- Patch Panels & Structured Cabling
- UPS for Control & IT Systems
- PDU — Power Distribution Units (Rack Level)
- Fibre Optic Distribution Panels
- Communications & Telecom Panels
- Cybersecurity & Demilitarized Zone (DMZ) Equipment
- Time Synchronisation (GPS / NTP)
- Control Room Layout — Full Example
- DCS Control System — Full Example
- SCADA / RTU Network — Full Example
- IT / OT Convergence Architecture
- Common Device Tags Reference
- Common Mistakes
- Expert Tips
Fundamentals
EPLAN Structure Reminder
1
2
3
| = Function designation → WHAT the panel / system does
+ Location designation → WHERE the panel / cabinet physically is
- Device designation → WHAT the component is
|
The Automation & IT Engineer’s Primary Concern
Unlike power panels where function = electrical role, in automation and IT:
= reflects the system layer (PLC, SCADA, DCS, network, safety)+ reflects the physical cabinet, rack, or room- reflects the specific module, card, server, or device
Full Tag Syntax Example
1
2
3
4
5
| =CTRL.PLC+CTRL_RM.CAB1-CPU01 PLC CPU in cabinet 1, control room
=SCADA.SERVER+SERVER_RM.RACK_A-SRV1 SCADA server in rack A, server room
=DCS.IO+FLD_CAB_A1-AI01 DCS AI module in field cabinet A1
=SIS.LOGIC+SAFE_RM.SIS_CAB1-CPU_S1 SIS logic solver in safety cabinet 1
=NETW.OT+CTRL_RM.NET_CAB-SW_PN1 PROFINET switch in network cabinet
|
Naming Philosophy for Automation & IT
System Layer Convention (Function =)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
| =CTRL General control system
=CTRL.PLC PLC layer
=CTRL.IO I/O layer
=CTRL.HMI HMI / operator interface layer
=CTRL.COMM Communications layer
=CTRL.SAFE Integrated safety (within PLC)
=DCS Distributed control system
=DCS.CTRL DCS controller layer
=DCS.IO DCS I/O layer
=DCS.HMI DCS operator station
=SCADA SCADA system
=SCADA.SERVER SCADA server layer
=SCADA.HMI SCADA client / HMI layer
=SCADA.COMM SCADA communications layer
=SIS Safety instrumented system
=SIS.LOGIC SIS logic solver layer
=SIS.IO SIS I/O layer
=ESD Emergency shutdown system
=RTU Remote terminal unit
=HIST Historian system
=MES Manufacturing execution system
=NETW Network infrastructure
=NETW.OT OT / industrial network
=NETW.IT IT / corporate network
=NETW.DMZ Demilitarised zone
=NETW.SAFE Safety network (black channel)
=SERVER Server infrastructure
=STORAGE Storage / backup
=COMMS Communications and telecom
=TIME Time synchronisation
=KVM KVM / console access
=PATCH Structured cabling / patch
=FIBER Fibre optic distribution
=CYBER Cybersecurity infrastructure
=PWR.CTRL Control power distribution
=PWR.24V 24VDC control power
=PWR.UPS UPS-backed supply
=PWR.IT IT power (230VAC clean)
|
Physical Cabinet Convention (Location +)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
| +CTRL_RM Control room (room level)
+CTRL_RM.CAB1 PLC/control cabinet 1 in control room
+CTRL_RM.CAB2 PLC/control cabinet 2
+CTRL_RM.HMI_CAB HMI server cabinet
+CTRL_RM.NET_CAB Network cabinet
+CTRL_RM.UPS_CAB UPS cabinet
+SERVER_RM Server room (room level)
+SERVER_RM.RACK_A Server rack A
+SERVER_RM.RACK_B Server rack B
+SERVER_RM.NET_RACK Network rack
+SAFE_RM Safety equipment room
+SAFE_RM.SIS_CAB1 SIS cabinet 1
+FIELD Field (no enclosure)
+FLD_CAB_A1 Field remote I/O cabinet A1
|
PLC Panel — Small (Standalone Machine / Process)
Typical: single rack, compact PLC, up to ~256 I/O points Brands: Siemens S7-1200/1500, Allen-Bradley CompactLogix, Schneider M241/M340, Beckhoff CX series, Omron NX1P
Function Designations
1
2
3
4
5
6
7
8
9
10
11
12
| =CTRL Overall control function
=CTRL.PLC PLC CPU and rack
=CTRL.IO I/O modules
=CTRL.HMI HMI interface
=CTRL.COMM Communications modules
=CTRL.SAFE Safety modules (if integrated)
=PWR.CTRL Control panel power
=PWR.24V 24VDC control power rail
=PWR.UPS UPS buffer module
=SAFE Safety function (if separate)
=SAFE.ESTOP Emergency stop function
=SAFE.GUARD Guard monitoring function
|
Location Designations
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
| +CP1 Control panel 1 (the enclosure)
+CP1.POWER Power supply section (top DIN rail)
+CP1.PLC PLC rack / mounting area
+CP1.IO I/O module expansion area
+CP1.SAFE Safety relay / safety module section
+CP1.RELAY Auxiliary relay section
+CP1.BARRIER Zener barrier / galvanic isolator section
+CP1.DIST_24V 24VDC distribution (DIN rail fuse terminal blocks)
+CP1.COMM Communications modules section
+CP1.TERM Terminal section (field wiring)
+CP1.TERM.DI Digital input terminals
+CP1.TERM.DO Digital output terminals
+CP1.TERM.AI Analog input terminals (4-20mA / 0-10V)
+CP1.TERM.AO Analog output terminals
+CP1.TERM.RTD RTD / thermocouple input terminals
+CP1.TERM.SAFE Safety I/O terminal section
+CP1.TERM.COMM Communications terminals (RS485, etc.)
+CP1.TERM.POWER Power terminal section (mains in, 24VDC out)
+CP1.DOOR Door-mounted devices
+CP1.DOOR.HMI HMI touchscreen (door mounted)
+CP1.DOOR.OP Operator buttons, lamps, selectors (door)
+CP1.DOOR.USB USB / memory card access port
|
Full Tag Examples — Small PLC Panel
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
| --- Power Supply Section ---
=PWR.CTRL+CP1.POWER-QF_MAINS 230VAC incoming MCB
=PWR.CTRL+CP1.POWER-QF_CTRL Control circuits MCB
=PWR.CTRL+CP1.POWER-T1 Control transformer (if 230V→24VAC)
=PWR.24V+CP1.POWER-PS1 24VDC SMPS (e.g. SITOP, Phoenix QUINT)
=PWR.24V+CP1.POWER-PS2 24VDC SMPS redundant module
=PWR.UPS+CP1.POWER-UPS_BUF1 24VDC UPS buffer module (e.g. SITOP UPS1600)
=PWR.24V+CP1.DIST_24V-FT1 24VDC fuse terminal block — PLC supply
=PWR.24V+CP1.DIST_24V-FT2 24VDC fuse terminal block — I/O supply
=PWR.24V+CP1.DIST_24V-FT3 24VDC fuse terminal block — field sensors
=PWR.24V+CP1.DIST_24V-FT4 24VDC fuse terminal block — solenoids/outputs
=PWR.24V+CP1.DIST_24V-FT5 24VDC fuse terminal block — HMI supply
=PWR.24V+CP1.DIST_24V-FT6 24VDC fuse terminal block — safety system
--- PLC Rack ---
=CTRL.PLC+CP1.PLC-CPU1 PLC CPU module (e.g. S7-1515, L30ER)
=CTRL.PLC+CP1.PLC-PM1 PLC power module (system power)
=CTRL.PLC+CP1.PLC-IM1 Interface module (if expansion rack)
--- I/O Modules ---
=CTRL.IO+CP1.IO-DI01 Digital input module 01 (e.g. 16DI 24VDC)
=CTRL.IO+CP1.IO-DI02 Digital input module 02
=CTRL.IO+CP1.IO-DO01 Digital output module 01 (e.g. 16DO 24VDC)
=CTRL.IO+CP1.IO-DO02 Digital output module 02
=CTRL.IO+CP1.IO-AI01 Analog input module 01 (e.g. 8AI 4-20mA)
=CTRL.IO+CP1.IO-AI02 Analog input module 02
=CTRL.IO+CP1.IO-AO01 Analog output module 01
=CTRL.IO+CP1.IO-RTD01 RTD / thermocouple input module 01
=CTRL.IO+CP1.IO-CNT01 Counter / encoder input module 01
--- Communications ---
=CTRL.COMM+CP1.COMM-CM_PN1 PROFINET communications module
=CTRL.COMM+CP1.COMM-CM_PB1 PROFIBUS DP master module
=CTRL.COMM+CP1.COMM-CM_RS485 RS485 / Modbus RTU module
=CTRL.COMM+CP1.COMM-CM_ETH1 Ethernet module / port
=CTRL.COMM+CP1.COMM-CM_IOLINK1 IO-Link master module
=CTRL.COMM+CP1.COMM-CM_ASI1 AS-Interface master module
=CTRL.COMM+CP1.COMM-SW_PN1 PROFINET managed switch (in cabinet)
--- Safety ---
=CTRL.SAFE+CP1.SAFE-F3_ESTOP Safety relay — E-stop (e.g. PILZ PNOZ, Siemens 3SK)
=CTRL.SAFE+CP1.SAFE-F3_GUARD Safety relay — guard door monitoring
=CTRL.SAFE+CP1.SAFE-F3_LIGHT Safety relay — light curtain
=CTRL.SAFE+CP1.SAFE-F3_TWO_HAND Safety relay — two-hand control
=CTRL.SAFE+CP1.SAFE-F_SAFE_PLC Safety PLC module (e.g. S7-1500F CPU, GuardLogix)
=CTRL.SAFE+CP1.SAFE-DI_SAFE1 Safety digital input module
=CTRL.SAFE+CP1.SAFE-DO_SAFE1 Safety digital output module
--- Auxiliary Relays ---
=CTRL+CP1.RELAY-K1 Auxiliary relay 1 (signal amplification / isolation)
=CTRL+CP1.RELAY-K2 Auxiliary relay 2
=CTRL+CP1.RELAY-K3 Auxiliary relay 3
=CTRL+CP1.RELAY-K_WD Watchdog relay (PLC healthy output)
=CTRL+CP1.RELAY-K_FAULT General fault relay (common alarm)
--- Door Devices ---
=CTRL.HMI+CP1.DOOR.HMI-TP1 HMI touchpanel (e.g. Siemens KTP700, Allen-Bradley PV Plus)
=CTRL+CP1.DOOR.OP-SS_MODE Mode selector (Auto/Manual/Maintenance)
=CTRL+CP1.DOOR.OP-SS_LOCAL Local/Remote selector
=CTRL+CP1.DOOR.OP-SB_RESET Fault reset push button
=CTRL+CP1.DOOR.OP-SB_ACK Alarm acknowledge push button
=CTRL+CP1.DOOR.OP-HL_POWER Power on indicator (green)
=CTRL+CP1.DOOR.OP-HL_RUN System running indicator (green)
=CTRL+CP1.DOOR.OP-HL_FAULT System fault indicator (red)
=CTRL+CP1.DOOR.OP-HL_WARN Warning indicator (amber)
=CTRL+CP1.DOOR.OP-HL_COMM Communications fault indicator
=SAFE.ESTOP+CP1.DOOR.OP-SB_ESTOP Emergency stop mushroom head button
=CTRL+CP1.DOOR.USB-USB1 USB port (for program transfer / HMI update)
|
PLC Panel — Medium (Multi-Rack / Remote I/O)
Typical: main rack + 1-4 expansion racks or remote I/O drops, 256–2048 I/O points Brands: Siemens S7-1500 / ET200, Allen-Bradley ControlLogix + Flex/Point I/O, Schneider M580 + STB/EIO
Location Designations — Multi-Rack
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
| +CP1 Main PLC cabinet
+CP1.MAIN_RACK Main CPU rack section
+CP1.EXP_RACK1 Expansion rack 1 section (within same cabinet)
+CP1.EXP_RACK2 Expansion rack 2 section
+CP1.POWER Power supply section
+CP1.DIST_24V 24VDC distribution section
+CP1.COMM Communications section
+CP1.SAFE Safety section
+CP1.RELAY Auxiliary relay section
+CP1.TERM Terminal section
+FLD_CAB_A1 Remote I/O cabinet A1 (field location)
+FLD_CAB_A1.PWR Power supply section
+FLD_CAB_A1.IO_RACK Remote I/O rack / modules
+FLD_CAB_A1.SAFE Safety I/O section (if SIL-rated)
+FLD_CAB_A1.TERM Terminal section (field wiring)
+FLD_CAB_A1.COMM Comms / network section (switch, fibre converter)
+FLD_CAB_A2 Remote I/O cabinet A2
+FLD_CAB_A2.PWR Power supply section
+FLD_CAB_A2.IO_RACK Remote I/O rack
+FLD_CAB_A2.TERM Terminal section
+FLD_CAB_B1 Remote I/O cabinet B1 (different area)
+FLD_CAB_C1 Remote I/O cabinet C1 (different area)
|
Full Tag Examples — Remote I/O Drop
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| =PWR.24V+FLD_CAB_A1.PWR-PS1 Remote I/O 24VDC power supply
=PWR.24V+FLD_CAB_A1.PWR-PS2 Remote I/O 24VDC redundant supply
=PWR.24V+FLD_CAB_A1.PWR-FT1 Fused terminal block — I/O modules
=PWR.24V+FLD_CAB_A1.PWR-FT2 Fused terminal block — field sensors
=CTRL.IO+FLD_CAB_A1.IO_RACK-IM1 Interface / coupling module (ET200 IM, FlexBus)
=CTRL.IO+FLD_CAB_A1.IO_RACK-DI01 DI module 01
=CTRL.IO+FLD_CAB_A1.IO_RACK-DI02 DI module 02
=CTRL.IO+FLD_CAB_A1.IO_RACK-DO01 DO module 01
=CTRL.IO+FLD_CAB_A1.IO_RACK-AI01 AI module 01
=CTRL.IO+FLD_CAB_A1.IO_RACK-AO01 AO module 01
=CTRL.IO+FLD_CAB_A1.IO_RACK-RTD01 RTD module 01
=CTRL.COMM+FLD_CAB_A1.COMM-SW_PN1 PROFINET switch (managed, DIN rail)
=CTRL.COMM+FLD_CAB_A1.COMM-FC_FIBER1 Fibre optic / media converter
=CTRL.COMM+FLD_CAB_A1.TERM-X_PN PROFINET patch connection terminals
=CTRL.SAFE+FLD_CAB_A1.SAFE-DI_S1 Safety DI module
=CTRL.SAFE+FLD_CAB_A1.SAFE-DO_S1 Safety DO module
=HEAT+FLD_CAB_A1.PWR-HTR1 Cabinet anti-condensation heater
=CTRL+FLD_CAB_A1.PWR-THERM1 Cabinet thermostat
|
PLC Panel — Large (Redundant CPU / High Availability)
Typical: redundant CPU pair, redundant power supplies, redundant I/O, redundant comms Brands: Siemens S7-400H / S7-1500H, Allen-Bradley ControlLogix SIL2/Redundancy, Schneider M580 Hot Standby, ABB AC500-S
Location Designations — Redundant PLC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
| +CP1 Main PLC cabinet (CPU A side)
+CP1.CPU_A CPU A rack section
+CP1.CPU_A.RACK CPU A physical rack
+CP1.CPU_A.PWR CPU A power supply
+CP1.CPU_B CPU B rack section (redundant partner)
+CP1.CPU_B.RACK CPU B physical rack
+CP1.CPU_B.PWR CPU B power supply
+CP1.SYNC Synchronisation module section (CPU A–B link)
+CP1.IO_A I/O rack A (primary)
+CP1.IO_B I/O rack B (redundant — same signals, parallel)
+CP1.COMM_A Communications rack A
+CP1.COMM_B Communications rack B
+CP1.PWR_MAIN Main cabinet power supply section
+CP1.DIST_24V_A 24VDC distribution rail A
+CP1.DIST_24V_B 24VDC distribution rail B (redundant)
+CP1.SAFE Safety section
+CP1.TERM Terminal section
+CP2 Secondary PLC cabinet (I/O expansion)
+CP2.IO_RACK1 I/O rack 1
+CP2.IO_RACK2 I/O rack 2
+CP2.PWR Power supply
+CP2.TERM Terminal section
|
Full Tag Examples — Redundant PLC
1
2
3
4
5
6
7
8
9
10
11
12
| =CTRL.PLC+CP1.CPU_A.RACK-CPU_A PLC CPU module A (primary)
=CTRL.PLC+CP1.CPU_B.RACK-CPU_B PLC CPU module B (standby)
=CTRL.PLC+CP1.SYNC-SYNC_MOD Sync / redundancy module (CPU A–B link)
=CTRL.PLC+CP1.CPU_A.PWR-PM_A Power module CPU A side
=CTRL.PLC+CP1.CPU_B.PWR-PM_B Power module CPU B side
=CTRL.IO+CP1.IO_A-DI01_A DI module 01 side A
=CTRL.IO+CP1.IO_B-DI01_B DI module 01 side B (redundant)
=CTRL.COMM+CP1.COMM_A-CM_PN_A PROFINET module A
=CTRL.COMM+CP1.COMM_B-CM_PN_B PROFINET module B (redundant)
=PWR.24V+CP1.DIST_24V_A-PS_A 24VDC power supply A
=PWR.24V+CP1.DIST_24V_B-PS_B 24VDC power supply B
=CTRL.PLC+CP1.CPU_A.RACK-IM_A Interface module rack A (for expansion)
|
Remote I/O Cabinets & Field Panels
Distributed around the plant, connected back to main PLC via PROFINET / EtherNet/IP / PROFIBUS / Modbus TCP
Location Designations — Field Panel Types
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
| +RIO_CAB_01 Remote I/O cabinet 01 (process area 1)
+RIO_CAB_02 Remote I/O cabinet 02 (process area 2)
+RIO_CAB_03 Remote I/O cabinet 03 (process area 3)
+JB_CTRL_A1 Control junction box area A, box 1
+JB_CTRL_A2 Control junction box area A, box 2
+JB_CTRL_B1 Control junction box area B, box 1
+IOLINK_BOX_01 IO-Link master box 01 (near sensors)
+IOLINK_BOX_02 IO-Link master box 02
+ASI_BOX_01 AS-Interface junction box 01
+DP_BOX_01 PROFIBUS DP junction box 01 (Y-coupler area)
+EX_RIO_01 Ex-rated remote I/O cabinet 01 (hazardous area Zone 2)
+EX_RIO_02 Ex-rated remote I/O cabinet 02
|
Location Sub-Structure for Field Cabinet
1
2
3
4
5
6
7
8
9
10
11
12
13
| +RIO_CAB_01 Remote I/O cabinet 01
+RIO_CAB_01.PWR Power supplies
+RIO_CAB_01.RACK I/O rack modules
+RIO_CAB_01.SAFE Safety I/O (if SIL-rated field cabinet)
+RIO_CAB_01.BARRIER Zener barriers / galvanic isolators (Ex area)
+RIO_CAB_01.RELAY Output relay modules (if high current)
+RIO_CAB_01.COMM Communications / network section
+RIO_CAB_01.TERM.DI Digital input field terminals
+RIO_CAB_01.TERM.DO Digital output field terminals
+RIO_CAB_01.TERM.AI Analog input field terminals
+RIO_CAB_01.TERM.AO Analog output field terminals
+RIO_CAB_01.TERM.PWR Power supply field terminals
+RIO_CAB_01.TERM.EARTH Earth / screen terminals
|
Safety PLC / Safety Controller (SIS / ESD)
Standards: IEC 61508, IEC 61511 Brands: HIMA HIMax/HIMatrix, Triconex Tricon/Trident, Pilz PSS 4000, Siemens S7-1500 FSC, Rockwell GuardLogix, ABB AC500-S
Function Designations — Safety System
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| =SIS Safety instrumented system (overall)
=SIS.LOGIC Logic solver function
=SIS.IO Safety I/O function
=SIS.COMM Safety communications function
=SIS.POWER Safety system power function
=ESD Emergency shutdown system
=ESD.L1 ESD Level 1 — process shutdown
=ESD.L2 ESD Level 2 — emergency shutdown
=ESD.L3 ESD Level 3 — abandon platform (offshore)
=F&G Fire and gas system
=F&G.DET Detection function
=F&G.CTRL F&G control logic function
=SAFE.ESTOP Emergency stop function
=SAFE.GUARD Guard / access interlock function
=BPCS Basic process control system (interface to SIS)
|
Location Designations — SIS Cabinet
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
| +SIS_CAB1 SIS cabinet 1 (main logic solver)
+SIS_CAB1.LOGIC_A Logic solver A (CPU / main module)
+SIS_CAB1.LOGIC_B Logic solver B (redundant)
+SIS_CAB1.LOGIC_C Logic solver C (triple modular redundancy — TMR)
+SIS_CAB1.IO_A Safety I/O rack A
+SIS_CAB1.IO_B Safety I/O rack B (redundant I/O)
+SIS_CAB1.POWER_A Safety system power supply A
+SIS_CAB1.POWER_B Safety system power supply B
+SIS_CAB1.COMM Safety communications section
+SIS_CAB1.TERM Safety terminal section
+SIS_CAB1.TERM.SIS_DI Safety DI terminals (SIL-rated sensors)
+SIS_CAB1.TERM.SIS_DO Safety DO terminals (final elements — SDV, ESD valves)
+SIS_CAB1.TERM.VOTING Voting / comparison terminals (2oo3 wiring)
+SIS_CAB1.TERM.BPCS_IFX BPCS interface terminals (read-only hardwired)
+SIS_CAB2 SIS cabinet 2 (additional I/O)
+SIS_CAB2.IO_RACK1 I/O rack 1
+SIS_CAB2.IO_RACK2 I/O rack 2
+SIS_CAB2.POWER Power supply
+SIS_CAB2.TERM Terminal section
+ESD_CAB1 ESD relay cabinet (hardwired ESD)
+ESD_CAB1.RELAY ESD relay section
+ESD_CAB1.POWER ESD power supply
+ESD_CAB1.TERM ESD terminal section
+F_G_CAB1 Fire and gas controller cabinet
+F_G_CAB1.CTRL F&G controller section
+F_G_CAB1.IO F&G I/O modules
+F_G_CAB1.POWER F&G power supply
+F_G_CAB1.TERM F&G terminal section
|
Full Tag Examples — SIS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
| =SIS.LOGIC+SIS_CAB1.LOGIC_A-CPU_S_A SIS logic solver CPU A (e.g. HIMA F3 CPU)
=SIS.LOGIC+SIS_CAB1.LOGIC_B-CPU_S_B SIS logic solver CPU B (redundant)
=SIS.LOGIC+SIS_CAB1.LOGIC_C-CPU_S_C SIS logic solver CPU C (TMR third)
=SIS.IO+SIS_CAB1.IO_A-DI_S01_A Safety DI module 01 side A
=SIS.IO+SIS_CAB1.IO_B-DI_S01_B Safety DI module 01 side B
=SIS.IO+SIS_CAB1.IO_A-DO_S01_A Safety DO module 01 side A
=SIS.POWER+SIS_CAB1.POWER_A-PS_S_A Safety 24VDC supply A (isolated)
=SIS.POWER+SIS_CAB1.POWER_B-PS_S_B Safety 24VDC supply B (isolated)
=SIS.COMM+SIS_CAB1.COMM-CM_SIS_PN SIS PROFINET / Modbus comm module
=SIS.COMM+SIS_CAB1.COMM-CM_BPCS_IFX BPCS hardwired interface module
=ESD.L1+ESD_CAB1.RELAY-K_L1_01 ESD Level 1 relay 01
=ESD.L2+ESD_CAB1.RELAY-K_L2_01 ESD Level 2 relay 01
=F&G.CTRL+F_G_CAB1.CTRL-FG_CTRL1 F&G controller (e.g. Hochiki, Notifier ONYX)
=F&G.DET+F_G_CAB1.IO-DI_FG01 F&G detection input module
|
DCS — Distributed Control System
Brands: Honeywell Experion PKS, ABB 800xA / System 500, Emerson DeltaV, Yokogawa CENTUM VP, Siemens PCS 7, Rockwell PlantPAx
Function Designations — DCS
1
2
3
4
5
6
7
8
9
10
11
12
13
| =DCS DCS overall system
=DCS.CTRL DCS controller layer
=DCS.IO DCS I/O layer
=DCS.FCS Field control station function
=DCS.IOP I/O processor function
=DCS.COMM DCS communications / control network
=DCS.HMI DCS operator station function
=DCS.ENG DCS engineering station function
=DCS.HIST DCS integrated historian
=DCS.OPC OPC server / gateway function
=DCS.REDUND Redundancy function
=DCS.POWER DCS system power function
=DCS.SAFE DCS safety layer (if integrated)
|
Location Designations — DCS Cabinets
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
| +DCS_CAB1 DCS cabinet 1 (main controller)
+DCS_CAB1.FCS_A Field control station A (main CPU / controller)
+DCS_CAB1.FCS_B Field control station B (redundant CPU)
+DCS_CAB1.IO_RACK_A I/O rack A (primary I/O modules)
+DCS_CAB1.IO_RACK_B I/O rack B (redundant I/O)
+DCS_CAB1.IOP1 I/O processor 1
+DCS_CAB1.IOP2 I/O processor 2
+DCS_CAB1.POWER_A DCS power supply A
+DCS_CAB1.POWER_B DCS power supply B (redundant)
+DCS_CAB1.COMM DCS control network section
+DCS_CAB1.COMM.CNT_A Control network interface A
+DCS_CAB1.COMM.CNT_B Control network interface B (redundant)
+DCS_CAB1.TERM Terminal section
+DCS_CAB2 DCS cabinet 2 (additional I/O)
+DCS_CAB2.IO_RACK_1 I/O rack 1
+DCS_CAB2.IO_RACK_2 I/O rack 2
+DCS_CAB2.IO_RACK_3 I/O rack 3
+DCS_CAB2.POWER Power supply section
+DCS_CAB2.TERM Terminal section
+DCS_CAB3 DCS cabinet 3 (safety / SIS — if integrated)
+DCS_CAB3.SIS_IO SIS I/O modules
+DCS_CAB3.POWER Safety power supply
+DCS_CAB3.TERM Safety terminal section
+DCS_SERVER_CAB DCS server cabinet
+DCS_SERVER_CAB.APP_SRV Application server / history server
+DCS_SERVER_CAB.OPC_SRV OPC DA/UA server
+DCS_SERVER_CAB.PRINT_SRV Print server
+DCS_SERVER_CAB.NET_SW Control network managed switch
+DCS_SERVER_CAB.UPS Cabinet UPS / power conditioner
|
Full Tag Examples — DCS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
| =DCS.FCS+DCS_CAB1.FCS_A-FCS_A1 DCS field control station A (e.g. DeltaV M-series)
=DCS.FCS+DCS_CAB1.FCS_B-FCS_B1 DCS FCS B (redundant)
=DCS.IO+DCS_CAB1.IO_RACK_A-AI_01A DCS AI module 01 side A (8-ch 4-20mA HART)
=DCS.IO+DCS_CAB1.IO_RACK_B-AI_01B DCS AI module 01 side B (redundant)
=DCS.IO+DCS_CAB1.IO_RACK_A-AO_01A DCS AO module 01 side A
=DCS.IO+DCS_CAB1.IO_RACK_A-DI_01 DCS DI module 01
=DCS.IO+DCS_CAB1.IO_RACK_A-DO_01 DCS DO module 01
=DCS.IO+DCS_CAB1.IO_RACK_A-HART_MUX1 HART multiplexer module
=DCS.IO+DCS_CAB1.IO_RACK_A-FF_01 Foundation Fieldbus H1 card
=DCS.POWER+DCS_CAB1.POWER_A-PS_DCS_A DCS power supply A (24VDC, isolated)
=DCS.POWER+DCS_CAB1.POWER_B-PS_DCS_B DCS power supply B
=DCS.COMM+DCS_CAB1.COMM.CNT_A-NIC_CNT_A Control network NIC A
=DCS.COMM+DCS_CAB1.COMM.CNT_B-NIC_CNT_B Control network NIC B
=DCS.HIST+DCS_SERVER_CAB.APP_SRV-SRV_HIST DCS historian / application server
=DCS.OPC+DCS_SERVER_CAB.OPC_SRV-SRV_OPC OPC DA/UA server
=DCS.COMM+DCS_SERVER_CAB.NET_SW-SW_CNT1 Control network switch
|
SCADA System Panels
Typical SCADA stack: RTUs in field → comms network → SCADA server → HMI clients
Function Designations — SCADA
1
2
3
4
5
6
7
8
9
10
11
12
13
| =SCADA SCADA system overall
=SCADA.SERVER SCADA server function
=SCADA.HMI SCADA HMI client function
=SCADA.HIST SCADA historian function
=SCADA.ENG Engineering / development workstation
=SCADA.OPC OPC server / gateway function
=SCADA.COMM SCADA WAN / LAN communications
=SCADA.FRONT_END SCADA front-end processor / data concentrator
=SCADA.RTU_IFX RTU interface gateway function
=SCADA.ALARM Alarm management system function
=SCADA.REPORT Report server function
=SCADA.DR Disaster recovery system function
=SCADA.WEB Web client / thin client function
|
Location Designations — SCADA Panels
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
| +CTRL_RM Control room (room level)
+CTRL_RM.SCADA_CAB1 SCADA primary server cabinet
+CTRL_RM.SCADA_CAB1.MAIN_SRV Primary SCADA server
+CTRL_RM.SCADA_CAB1.STBY_SRV Standby SCADA server (hot standby)
+CTRL_RM.SCADA_CAB1.OPC_SRV OPC server
+CTRL_RM.SCADA_CAB1.FEP Front-end processor (data concentrator)
+CTRL_RM.SCADA_CAB1.COMM_GW Communications gateway / router
+CTRL_RM.SCADA_CAB1.NET_SW LAN switch
+CTRL_RM.SCADA_CAB1.UPS Cabinet UPS
+CTRL_RM.SCADA_CAB1.PDU PDU (rack power)
+CTRL_RM.HIST_CAB Historian server cabinet
+CTRL_RM.HIST_CAB.HIST_SRV Historian server
+CTRL_RM.HIST_CAB.HIST_SRV_STB Standby historian server
+CTRL_RM.NET_CAB Network cabinet (OT LAN)
+CTRL_RM.NET_CAB.CORE_SW Core OT network switch
+CTRL_RM.NET_CAB.FIREWALL OT/IT firewall
+CTRL_RM.NET_CAB.ROUTER WAN router
+CTRL_RM.DESK1 Operator desk / console 1
+CTRL_RM.DESK1.PC_HMI1 HMI workstation 1
+CTRL_RM.DESK1.MON1 Monitor 1
+CTRL_RM.DESK1.MON2 Monitor 2
+CTRL_RM.DESK2 Operator desk 2
+CTRL_RM.DESK2.PC_HMI2 HMI workstation 2
+CTRL_RM.ENG_DESK Engineering desk
+CTRL_RM.ENG_DESK.PC_ENG Engineering workstation
+SERVER_RM Server room
+SERVER_RM.RACK_A Server rack A (SCADA primary)
+SERVER_RM.RACK_B Server rack B (SCADA DR / backup)
+SERVER_RM.NET_RACK Network rack
|
Full Tag Examples — SCADA
1
2
3
4
5
6
7
8
9
10
11
| =SCADA.SERVER+CTRL_RM.SCADA_CAB1.MAIN_SRV-SRV_SCADA1 Primary SCADA server
=SCADA.SERVER+CTRL_RM.SCADA_CAB1.STBY_SRV-SRV_SCADA2 Standby SCADA server
=SCADA.OPC+CTRL_RM.SCADA_CAB1.OPC_SRV-SRV_OPC1 OPC DA/UA server
=SCADA.FRONT_END+CTRL_RM.SCADA_CAB1.FEP-FEP1 Front-end processor
=SCADA.COMM+CTRL_RM.SCADA_CAB1.COMM_GW-RTR1 WAN router / comm gateway
=SCADA.COMM+CTRL_RM.NET_CAB.CORE_SW-SW_OT_CORE Core OT switch
=SCADA.HIST+CTRL_RM.HIST_CAB.HIST_SRV-SRV_HIST1 Historian server
=SCADA.HMI+CTRL_RM.DESK1.PC_HMI1-WS_HMI1 HMI workstation 1
=SCADA.ENG+CTRL_RM.ENG_DESK.PC_ENG-WS_ENG1 Engineering workstation
=SCADA.DR+SERVER_RM.RACK_B-SRV_SCADA_DR DR SCADA server
=PWR.UPS+CTRL_RM.SCADA_CAB1.UPS-UPS_SCADA SCADA cabinet UPS
|
RTU — Remote Terminal Unit Panels
Used for remote unmanned sites: pump stations, gas gates, substations, water reservoirs Brands: Schneider SCADAPack, ABB RTU560, GE D20/D400, Yokogawa STARDOM, SEL RTAC, Moxa V2406, Advantech
Function Designations — RTU
1
2
3
4
5
6
7
8
9
10
11
| =RTU RTU system overall
=RTU.CPU RTU processor / controller function
=RTU.IO RTU I/O function
=RTU.COMM RTU communications function
=RTU.COMM.WAN WAN / telemetry link (GPRS/4G/radio/fibre)
=RTU.COMM.LOCAL Local communications (RS485, PROFIBUS, Modbus)
=RTU.POWER RTU power supply function
=RTU.BATT RTU battery backup function
=RTU.METER RTU metering integration function
=RTU.IED IED interface function (for substations)
=RTU.SAFE RTU safety output function
|
Location Designations — RTU Panel
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
| +RTU_PNL1 RTU panel 1 (remote site enclosure)
+RTU_PNL1.POWER Power supply section (230VAC and 24VDC)
+RTU_PNL1.BATT Battery backup section
+RTU_PNL1.CPU RTU processor / controller module section
+RTU_PNL1.IO I/O modules section
+RTU_PNL1.IO.DI Digital input modules
+RTU_PNL1.IO.DO Digital output modules
+RTU_PNL1.IO.AI Analog input modules
+RTU_PNL1.IO.AO Analog output modules
+RTU_PNL1.IO.PULSE Pulse / counter inputs (for meters)
+RTU_PNL1.COMM Communications section
+RTU_PNL1.COMM.WAN WAN modem / radio / fibre section
+RTU_PNL1.COMM.LOCAL Local serial / fieldbus comms section
+RTU_PNL1.COMM.ETH Ethernet switch section
+RTU_PNL1.METERING Metering / IED interface section
+RTU_PNL1.TERM Terminal section
+RTU_PNL1.TERM.FIELD Field instrument terminals
+RTU_PNL1.TERM.POWER Power terminals (mains, 24VDC)
+RTU_PNL1.TERM.COMM Communications terminals
+RTU_PNL2 RTU panel 2 (second remote site)
+RTU_PNL3 RTU panel 3
|
Full Tag Examples — RTU Panel
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| =RTU.POWER+RTU_PNL1.POWER-QF_MAINS 230VAC incoming MCB
=RTU.POWER+RTU_PNL1.POWER-PS1 24VDC SMPS
=RTU.BATT+RTU_PNL1.BATT-BATT1 12V/24V lead-acid or Li-ion backup battery
=RTU.BATT+RTU_PNL1.BATT-CHRG1 Battery charger / UPS module
=RTU.CPU+RTU_PNL1.CPU-RTU_CPU1 RTU processor module
=RTU.IO+RTU_PNL1.IO.DI-DI01 RTU DI module 01
=RTU.IO+RTU_PNL1.IO.AI-AI01 RTU AI module 01 (4-20mA)
=RTU.IO+RTU_PNL1.IO.DO-DO01 RTU DO module 01
=RTU.IO+RTU_PNL1.IO.PULSE-CNT01 Pulse counter module (for kWh meters)
=RTU.COMM.WAN+RTU_PNL1.COMM.WAN-MODEM1 4G LTE modem / cellular router
=RTU.COMM.WAN+RTU_PNL1.COMM.WAN-RADIO1 Licensed radio modem (900MHz / UHF)
=RTU.COMM.LOCAL+RTU_PNL1.COMM.LOCAL-CM_485_1 RS485 Modbus serial port 1
=RTU.COMM.LOCAL+RTU_PNL1.COMM.LOCAL-CM_IEC104 IEC 60870-5-104 comms module
=RTU.COMM.ETH+RTU_PNL1.COMM.ETH-SW_RTU1 Managed Ethernet switch (DIN rail)
=RTU.METER+RTU_PNL1.METERING-IED_PROT1 Protection IED interface (SEL, ABB)
=RTU.METER+RTU_PNL1.METERING-KWH_M1 Energy meter (Modbus RTU)
=RTU.COMM.WAN+RTU_PNL1.COMM.WAN-ANT_4G 4G antenna assembly
=RTU.COMM.WAN+RTU_PNL1.COMM.WAN-GPS1 GPS receiver (for time sync)
|
Marshalling Cabinets (Automation-Focused)
Interface layer between field cables and DCS/PLC/SIS systems
Location Designations — Automation Marshalling
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
| +MARSH_CAB_A Marshalling cabinet A (I&C signals)
+MARSH_CAB_A.POWER Power supply section
+MARSH_CAB_A.DI Digital input marshalling section
+MARSH_CAB_A.DO Digital output marshalling section
+MARSH_CAB_A.AI Analog input marshalling section (HART signals)
+MARSH_CAB_A.AO Analog output marshalling section
+MARSH_CAB_A.RTD RTD / thermocouple marshalling section
+MARSH_CAB_A.BARRIER Zener barrier / HART isolator section
+MARSH_CAB_A.RELAY Output relay section (for DO isolation)
+MARSH_CAB_A.TERM.FIELD Field cable terminations (left gland plate side)
+MARSH_CAB_A.TERM.SYSTEM System cable terminations (right, to DCS/PLC)
+MARSH_CAB_B Marshalling cabinet B (safety signals)
+MARSH_CAB_B.DI_SAFE Safety DI marshalling
+MARSH_CAB_B.DO_SAFE Safety DO marshalling
+MARSH_CAB_B.BARRIER_S Safety barriers (SIL-rated isolators)
+MARSH_CAB_B.TERM.FIELD Safety field terminals
+MARSH_CAB_B.TERM.SIS SIS system terminals
+TERM_CAB_01 Termination cabinet 01 (cable glanding only — no active devices)
+TERM_CAB_01.GLAND Cable gland plate section
+TERM_CAB_01.TERM.DI DI termination rail
+TERM_CAB_01.TERM.AI AI termination rail
|
Instrumentation Cabinets (Loop-Powered)
Location Designations
1
2
3
4
5
6
7
8
9
10
11
12
| +INST_CAB_01 Instrumentation cabinet 01
+INST_CAB_01.POWER Loop power supply section
+INST_CAB_01.BARRIER Intrinsic safety barriers (Zener / galvanic)
+INST_CAB_01.BARRIER.AI Barriers for AI signals
+INST_CAB_01.BARRIER.DI Barriers for DI signals
+INST_CAB_01.BARRIER.DO Barriers for DO signals
+INST_CAB_01.ISOLATOR HART galvanic isolators section
+INST_CAB_01.TEMP_TX Temperature transmitter / head-mount TX section
+INST_CAB_01.TERM Terminal section
+INST_CAB_01.TERM.SAFE Safety terminals (blue — intrinsically safe)
+INST_CAB_01.TERM.NONEX Non-IS terminals (grey — non-Ex)
+INST_CAB_01.SIGNAL_COND Signal conditioner section
|
Full Tag Examples — Instrumentation Cabinet
1
2
3
4
5
6
7
8
| =PWR.24V+INST_CAB_01.POWER-PS_LOOP1 Loop power supply 24VDC (e.g. Phoenix mini POWER)
=INST+INST_CAB_01.BARRIER.AI-Z_AI01 Zener barrier channel 01 — AI (e.g. MTL 7787+)
=INST+INST_CAB_01.BARRIER.AI-Z_AI02 Zener barrier channel 02 — AI
=INST+INST_CAB_01.BARRIER.DI-Z_DI01 Zener barrier channel 01 — DI
=INST+INST_CAB_01.BARRIER.DO-Z_DO01 Zener barrier channel 01 — DO
=INST+INST_CAB_01.ISOLATOR-ISO_AI01 HART galvanic isolator channel 01
=INST+INST_CAB_01.SIGNAL_COND-SC_01 4-20mA signal conditioner / splitter
=INST+INST_CAB_01.TEMP_TX-TT_301 Head-mount temperature transmitter TT-301
|
HMI Stations & Operator Consoles
Location Designations
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
| +OP_STN_1 Operator station 1
+OP_STN_1.HMI HMI panel (touchscreen or display)
+OP_STN_1.PC PC / thin client
+OP_STN_1.CTRL Control buttons, lamps, selectors
+OP_STN_1.ESTOP Emergency stop section
+OP_STN_1.KEY Key switches section
+OP_STN_1.PRINTER Alarm / event printer
+OP_STN_2 Operator station 2
+OP_CONSOLE_1 Operator console / desk 1 (large control room)
+OP_CONSOLE_1.MON1 Monitor 1 (left)
+OP_CONSOLE_1.MON2 Monitor 2 (centre)
+OP_CONSOLE_1.MON3 Monitor 3 (right)
+OP_CONSOLE_1.PC Console PC / workstation
+OP_CONSOLE_1.KVM KVM switch / extender
+OP_CONSOLE_1.CTRL Operator controls (buttons, lamps)
+OP_CONSOLE_1.ESTOP Console e-stop
+PANEL_VIEW_1 Standalone HMI panel (wall-mounted or machine-mounted)
+PENDANT_1 Operator pendant 1 (handheld, machine)
+PENDANT_1.HMI Pendant HMI display
+PENDANT_1.CTRL Pendant controls
+PENDANT_1.ESTOP Pendant emergency stop
+MAIN_DISPLAY_WALL Video wall / main display wall (control room)
+MAIN_DISPLAY_WALL.CTRL Display wall controller
+MAIN_DISPLAY_WALL.PROC Display wall processor
|
Full Tag Examples — HMI / Operator Station
1
2
3
4
5
6
7
8
9
10
11
| =CTRL.HMI+OP_STN_1.HMI-TP_700 Siemens TP700 or equivalent HMI panel
=CTRL.HMI+OP_STN_1.PC-WS_HMI_1 HMI workstation / thin client
=CTRL+OP_STN_1.CTRL-SS_MODE Mode selector
=CTRL+OP_STN_1.CTRL-SB_RESET Reset button
=CTRL+OP_STN_1.CTRL-HL_FAULT Fault lamp
=CTRL+OP_STN_1.CTRL-HL_RUN Running lamp
=SAFE.ESTOP+OP_STN_1.ESTOP-SB_ESTOP E-stop push button
=SCADA.HMI+OP_CONSOLE_1.PC-WS_SCADA1 SCADA operator workstation
=SCADA.HMI+OP_CONSOLE_1.MON1-MON1 Monitor 1 (SCADA overview display)
=SCADA.HMI+OP_CONSOLE_1.MON2-MON2 Monitor 2 (process graphic)
=KVM+OP_CONSOLE_1.KVM-KVM_SW1 KVM switch at console 1
|
Engineering Workstation Panels
1
2
3
4
5
6
7
8
9
| +ENG_CAB1 Engineering workstation cabinet
+ENG_CAB1.PC_ENG Engineering PC / laptop docking
+ENG_CAB1.PROG_LAPTOP Programming laptop connection
+ENG_CAB1.USB_HUB USB hub for programming cables
+ENG_CAB1.USB_PN PROFINET USB adapter (for S7 direct connect)
+ENG_CAB1.USB_PB PROFIBUS USB adapter
+ENG_CAB1.SERIAL_485 RS485 programming port
+ENG_CAB1.NET_PORT Ethernet port (isolated — programming only)
+ENG_CAB1.BREAKOUT Breakout patch panel for comms connections
|
Historian & Application Server Racks
OSIsoft PI, Honeywell PHD, Aspen InfoPlus.21, Wonderware Historian, Ignition Historian
Location Designations
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
| +SERVER_RM Server room
+SERVER_RM.RACK_HIST Historian server rack
+SERVER_RM.RACK_HIST.SRV_HIST_PRI Primary historian server
+SERVER_RM.RACK_HIST.SRV_HIST_STB Standby historian server
+SERVER_RM.RACK_HIST.SRV_HIST_DR DR historian server
+SERVER_RM.RACK_HIST.SRV_APP1 Application server 1 (asset framework, reports)
+SERVER_RM.RACK_HIST.SRV_APP2 Application server 2
+SERVER_RM.RACK_HIST.SRV_WEB Web server (PI WebAPI, Tableau, etc.)
+SERVER_RM.RACK_HIST.NAS1 NAS / attached storage for historian data
+SERVER_RM.RACK_HIST.SW_MGT Management network switch
+SERVER_RM.RACK_HIST.PDU_A PDU A (A-side power)
+SERVER_RM.RACK_HIST.PDU_B PDU B (B-side redundant power)
+SERVER_RM.RACK_HIST.PATCH Patch panel section
+SERVER_RM.RACK_HIST.FIBER_DIST Fibre distribution panel
+SERVER_RM.RACK_APP Application server rack (SCADA, MES, reporting)
+SERVER_RM.RACK_APP.SRV_SCADA_PRI Primary SCADA server
+SERVER_RM.RACK_APP.SRV_SCADA_STB Standby SCADA server
+SERVER_RM.RACK_APP.SRV_OPC_UA OPC UA server
+SERVER_RM.RACK_APP.SRV_MES MES server
+SERVER_RM.RACK_APP.SRV_REPORT Reporting server
+SERVER_RM.RACK_APP.SRV_DR Disaster recovery server
+SERVER_RM.RACK_APP.VIRT_HOST Virtualisation host (VMware / Hyper-V)
+SERVER_RM.RACK_APP.NAS2 SAN / NAS storage
|
Full Tag Examples — Server Rack
1
2
3
4
5
6
7
8
9
10
| =HIST+SERVER_RM.RACK_HIST.SRV_HIST_PRI-SRV_PI_PRI PI historian primary server
=HIST+SERVER_RM.RACK_HIST.SRV_HIST_STB-SRV_PI_STB PI historian standby
=SCADA.SERVER+SERVER_RM.RACK_APP.SRV_SCADA_PRI-SRV_SCADA_PRI SCADA primary server
=SCADA.SERVER+SERVER_RM.RACK_APP.SRV_SCADA_STB-SRV_SCADA_STB SCADA standby
=SCADA.OPC+SERVER_RM.RACK_APP.SRV_OPC_UA-SRV_OPC_UA OPC UA server
=MES+SERVER_RM.RACK_APP.SRV_MES-SRV_MES1 MES server
=SERVER+SERVER_RM.RACK_APP.VIRT_HOST-ESXI_HOST1 VMware ESXi host
=STORAGE+SERVER_RM.RACK_HIST.NAS1-NAS_HIST1 NAS storage for historian
=PWR.IT+SERVER_RM.RACK_HIST.PDU_A-PDU_A1 Rack PDU A side
=PWR.IT+SERVER_RM.RACK_HIST.PDU_B-PDU_B1 Rack PDU B side (redundant)
|
Network Infrastructure Cabinets
Location Designations — OT Network
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
| +NET_CAB_OT OT network cabinet (control room)
+NET_CAB_OT.CORE_SW Core OT switch section
+NET_CAB_OT.DIST_SW1 Distribution switch 1 section
+NET_CAB_OT.DIST_SW2 Distribution switch 2 section
+NET_CAB_OT.FIREWALL OT firewall / DMZ appliance section
+NET_CAB_OT.ROUTER WAN router section
+NET_CAB_OT.TIME_SRV NTP / GPS time server section
+NET_CAB_OT.FIBER_DIST Fibre distribution panel
+NET_CAB_OT.PATCH_ETH Ethernet patch panel
+NET_CAB_OT.PDU Rack PDU
+NET_CAB_OT.UPS Rack UPS
+NET_CAB_FIELD_A Field network cabinet area A
+NET_CAB_FIELD_A.SW1 Field switch 1 (access layer)
+NET_CAB_FIELD_A.MEDIA_CNV Fibre media converter section
+NET_CAB_FIELD_A.PATCH Patch panel
+NET_CAB_FIELD_B Field network cabinet area B
|
Industrial Network Cabinets (OT Network)
PROFINET, EtherNet/IP, Modbus TCP, PROFIBUS, DeviceNet, IO-Link, Foundation Fieldbus
Function Designations — OT Network
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
| =NETW.OT OT network function (overall)
=NETW.OT.CORE Core OT network function
=NETW.OT.DIST Distribution layer function
=NETW.OT.ACCESS Access layer (field switches) function
=NETW.OT.RING Ring topology (MRP/RSTP) function
=NETW.OT.PN PROFINET network function
=NETW.OT.EIP EtherNet/IP network function
=NETW.OT.MODBUS Modbus TCP network function
=NETW.OT.FIBER Fibre backbone function
=NETW.OT.SERIAL Serial / RS485 network function
=NETW.OT.HART HART network function
=NETW.OT.FF Foundation Fieldbus function
=NETW.OT.IOLINK IO-Link network function
=NETW.OT.ASI AS-Interface function
=NETW.OT.WIFI Industrial WiFi function
=NETW.DMZ DMZ function (OT/IT boundary)
=CYBER Cybersecurity function
|
Location Designations — OT Network Equipment
1
2
3
4
5
6
7
8
9
10
| +NET_CAB_OT.CORE_SW Core OT switch (Layer 2/3 managed)
+NET_CAB_OT.DIST_SW1 Distribution switch 1
+NET_CAB_OT.DIST_SW2 Distribution switch 2
+NET_CAB_OT.FIREWALL Firewall appliance (Fortinet, Cisco, Tofino)
+NET_CAB_OT.ROUTER Router (for WAN / telemetry links)
+NET_CAB_OT.DMZ_CAB DMZ cabinet (data diode, jump server)
+NET_CAB_OT.WIFI_AP Industrial WiFi access point
+FLD_CAB_A1.COMM.SW_PN1 Field PROFINET switch area A1
+FLD_CAB_B1.COMM.SW_PN2 Field PROFINET switch area B1
+RIO_CAB_01.COMM.SW_PN3 Remote I/O cabinet switch 01
|
Full Tag Examples — OT Network
1
2
3
4
5
6
7
8
9
10
11
| =NETW.OT.CORE+NET_CAB_OT.CORE_SW-SW_CORE_OT Core OT managed switch (e.g. Cisco IE4000)
=NETW.OT.DIST+NET_CAB_OT.DIST_SW1-SW_DIST_OT1 Distribution switch 1 (e.g. Hirschmann MACH)
=NETW.OT.DIST+NET_CAB_OT.DIST_SW2-SW_DIST_OT2 Distribution switch 2
=NETW.OT.PN+FLD_CAB_A1.COMM.SW_PN1-SW_PN_A1 PROFINET field switch area A1 (e.g. Scalance XC208)
=NETW.OT.FIBER+NET_CAB_OT.FIBER_DIST-FDP_OT1 Fibre distribution panel OT
=NETW.OT.ACCESS+FLD_CAB_B1.COMM.FC_1-FC_FIBER_B1 Fibre/copper media converter area B1
=NETW.DMZ+NET_CAB_OT.FIREWALL-FW_OT_IT OT/IT firewall (Fortinet FortiGate, Tofino)
=CYBER+NET_CAB_OT.DMZ_CAB-DATA_DIODE1 Data diode (Owl, Waterfall — unidirectional)
=NETW.OT.WIFI+NET_CAB_OT.WIFI_AP-AP_INDUS1 Industrial WiFi AP (e.g. Cisco Catalyst IW6300)
=NETW.OT.SERIAL+RIO_CAB_01.COMM.CM_485_1-RS485_GW RS485 Modbus serial gateway
=TIME+NET_CAB_OT.TIME_SRV-NTP_SRV1 NTP time server (GPS-disciplined)
|
IT / Corporate Network Racks (IT Network)
Function Designations — IT Network
1
2
3
4
5
6
7
8
9
10
11
12
13
| =NETW.IT IT / corporate network function
=NETW.IT.CORE Core IT switch function
=NETW.IT.DIST Distribution switch function
=NETW.IT.ACCESS Access layer switch function
=NETW.IT.WIFI Corporate WiFi function
=NETW.IT.VOIP VoIP / telephony function
=NETW.IT.ROUTER WAN / Internet router function
=NETW.IT.FIREWALL IT perimeter firewall function
=NETW.IT.PROXY Web proxy / content filter function
=NETW.IT.DNS_DHCP DNS/DHCP server function
=NETW.IT.AD Active Directory / identity function
=NETW.IT.EMAIL Email server function
=NETW.IT.BACKUP Backup / DR function
|
Location Designations — IT Rack
1
2
3
4
5
6
7
8
9
10
11
12
| +SERVER_RM.NET_RACK IT network rack
+SERVER_RM.NET_RACK.CORE_SW_IT Core IT switch
+SERVER_RM.NET_RACK.DIST_SW_IT1 Distribution switch 1
+SERVER_RM.NET_RACK.DIST_SW_IT2 Distribution switch 2
+SERVER_RM.NET_RACK.ROUTER_WAN WAN router (ISP connection)
+SERVER_RM.NET_RACK.FIREWALL_IT IT perimeter firewall
+SERVER_RM.NET_RACK.PROXY Web proxy appliance
+SERVER_RM.NET_RACK.PATCH_IT1 Patch panel IT — Cat6 rack 1
+SERVER_RM.NET_RACK.PATCH_IT2 Patch panel IT — Cat6 rack 2
+SERVER_RM.NET_RACK.FDP_IT Fibre distribution panel IT
+SERVER_RM.NET_RACK.PDU_IT Rack PDU (IT power)
+SERVER_RM.NET_RACK.UPS_IT Rack UPS IT
|
Server Racks & Blade Centres
Location Designations — Server Rack Detailed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
| +SERVER_RM.RACK_A Server rack A
+SERVER_RM.RACK_A.SRV1 Server / node 1 (1U, 2U, etc.)
+SERVER_RM.RACK_A.SRV2 Server / node 2
+SERVER_RM.RACK_A.SRV3 Server / node 3
+SERVER_RM.RACK_A.BLADE_CHASSIS Blade chassis (e.g. Dell PowerEdge M1000e, HPE Synergy)
+SERVER_RM.RACK_A.BLADE1 Blade module 1
+SERVER_RM.RACK_A.BLADE2 Blade module 2
+SERVER_RM.RACK_A.BLADE3 Blade module 3
+SERVER_RM.RACK_A.SAN_SW SAN switch (Fibre Channel)
+SERVER_RM.RACK_A.NAS NAS appliance
+SERVER_RM.RACK_A.TAPE_LIB Tape library (backup)
+SERVER_RM.RACK_A.KVM KVM switch
+SERVER_RM.RACK_A.CONSOLE Console port switch / IPMI aggregator
+SERVER_RM.RACK_A.PDU_A Rack PDU A (left side, A-power)
+SERVER_RM.RACK_A.PDU_B Rack PDU B (right side, B-power)
+SERVER_RM.RACK_A.PATCH Patch panel (Cat6 / fibre)
+SERVER_RM.RACK_B Server rack B
+SERVER_RM.RACK_C Server rack C
|
Full Tag Examples — Server Rack
1
2
3
4
5
6
7
8
9
| =SERVER+SERVER_RM.RACK_A.SRV1-HP_PROLIANT1 Application server 1
=SERVER+SERVER_RM.RACK_A.SRV2-DELL_R750_2 Application server 2
=SERVER+SERVER_RM.RACK_A.BLADE_CHASSIS-CHASSIS1 Blade chassis
=STORAGE+SERVER_RM.RACK_A.NAS-NAS_NETAPP1 NAS storage
=KVM+SERVER_RM.RACK_A.KVM-KVM_RACK_A Rack KVM switch
=NETW.IT.ACCESS+SERVER_RM.RACK_A.SW_MGMT-SW_MGMT_A Out-of-band management switch
=PWR.IT+SERVER_RM.RACK_A.PDU_A-PDU_RACK_A_A Rack PDU A (A-side)
=PWR.IT+SERVER_RM.RACK_A.PDU_B-PDU_RACK_A_B Rack PDU B (B-side, redundant)
=PATCH+SERVER_RM.RACK_A.PATCH-PP_CAT6_A1 Cat6 patch panel rack A
|
Storage & Backup Systems
1
2
3
4
5
6
7
8
9
| +STORAGE_RM Storage / backup room (or section of server room)
+STORAGE_RM.SAN_RACK SAN rack
+STORAGE_RM.SAN_RACK.SAN_ARRAY1 SAN storage array 1
+STORAGE_RM.SAN_RACK.SAN_ARRAY2 SAN storage array 2
+STORAGE_RM.SAN_RACK.FC_SW1 Fibre Channel SAN switch 1
+STORAGE_RM.SAN_RACK.FC_SW2 Fibre Channel SAN switch 2
+STORAGE_RM.SAN_RACK.NAS1 NAS head 1
+STORAGE_RM.SAN_RACK.TAPE_LIB Tape library / LTO drive
+STORAGE_RM.SAN_RACK.BACKUP_SRV Backup server (Veeam, CommVault, etc.)
|
KVM & Console Access Systems
1
2
3
4
5
6
7
8
9
| +KVM_CAB KVM / console access cabinet
+KVM_CAB.KVM_MATRIX KVM matrix switch (centralised)
+KVM_CAB.CAT_TX KVM CAT extender — transmitter side
+KVM_CAB.IPKVM IP KVM / IPMI aggregator (remote access)
+KVM_CAB.SERIAL_CON Serial console server (Opengear, Digi, Lantronix)
+OP_CONSOLE_1.KVM KVM receiver at operator console 1
+OP_CONSOLE_2.KVM KVM receiver at operator console 2
+ENG_CAB1.KVM KVM receiver at engineering workstation
|
Full Tag Examples — KVM
1
2
3
4
5
| =KVM+KVM_CAB.KVM_MATRIX-KVM_MATRIX1 KVM matrix switch (e.g. Guntermann, Raritan, Aten)
=KVM+KVM_CAB.CAT_TX-CAT_TX_SRV1 CAT6 KVM transmitter connected to server 1
=KVM+OP_CONSOLE_1.KVM-CAT_RX_CONS1 CAT6 KVM receiver at console 1
=KVM+KVM_CAB.IPKVM-IPKVM_AGGR1 IP KVM aggregator (Lantronix SLC)
=KVM+KVM_CAB.SERIAL_CON-SCS_CON1 Serial console server (Opengear CM7100)
|
Patch Panels & Structured Cabling
1
2
3
4
5
6
| +NET_CAB_OT.PATCH_ETH Ethernet patch panel — OT (Cat6/6A)
+SERVER_RM.NET_RACK.PATCH_IT1 Ethernet patch panel — IT rack
+NET_CAB_OT.FIBER_DIST Fibre distribution panel — OT
+SERVER_RM.RACK_A.PATCH Patch panel — server rack A
+MDA.PATCH_MDA Main distribution area patch (data centre)
+HDA1.PATCH_HDA Horizontal distribution area patch
|
Full Tag Examples — Patch
1
2
3
4
| =PATCH+NET_CAB_OT.PATCH_ETH-PP_ETH_OT1 OT 24-port Cat6 patch panel
=FIBER+NET_CAB_OT.FIBER_DIST-FDP_OT1 OT fibre distribution panel (LC duplex)
=PATCH+SERVER_RM.NET_RACK.PATCH_IT1-PP_IT1 IT 48-port Cat6A patch panel
=FIBER+SERVER_RM.RACK_A.PATCH-FDP_SRV_A Server rack A fibre patch panel
|
UPS for Control & IT Systems
Location Designations
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| +UPS_RM UPS room (or section within server room)
+UPS_RM.UPS_OT OT / control system UPS
+UPS_RM.UPS_OT.UPS_UNIT UPS main unit
+UPS_RM.UPS_OT.BATT1 Battery string 1
+UPS_RM.UPS_OT.BATT2 Battery string 2
+UPS_RM.UPS_OT.DIST_BD UPS output distribution board
+UPS_RM.UPS_IT IT system UPS
+UPS_RM.UPS_IT.UPS_UNIT UPS main unit
+UPS_RM.UPS_IT.BATT1 Battery string 1
+UPS_RM.UPS_IT.DIST_BD UPS output distribution board
+SERVER_RM.RACK_A.UPS_RACK Rack-mount UPS for server rack A
+CTRL_RM.SCADA_CAB1.UPS Cabinet-mount UPS for SCADA cabinet
+CP1.POWER.UPS_BUF DIN-rail 24VDC UPS buffer module (inside PLC panel)
|
PDU — Power Distribution Units (Rack Level)
1
2
3
4
5
6
| +SERVER_RM.RACK_A.PDU_A Vertical rack PDU A (A-side power, left)
+SERVER_RM.RACK_A.PDU_B Vertical rack PDU B (B-side power, right)
+SERVER_RM.RACK_B.PDU_A Rack B PDU A
+SERVER_RM.RACK_B.PDU_B Rack B PDU B
+NET_CAB_OT.PDU OT network cabinet PDU
+CTRL_RM.SCADA_CAB1.PDU SCADA cabinet PDU
|
Full Tag Examples — PDU
1
2
3
| =PWR.IT+SERVER_RM.RACK_A.PDU_A-PDU_A_RACK_A Rack PDU A — 32A IEC 60309 input, 24x C13 outlets
=PWR.IT+SERVER_RM.RACK_A.PDU_B-PDU_B_RACK_A Rack PDU B — redundant B-side
=METER+SERVER_RM.RACK_A.PDU_A-METER_PDU_A Metered PDU — per-outlet monitoring
|
Fibre Optic Distribution Panels
1
2
3
4
5
6
7
8
| +FDP_OT_MAIN Main OT fibre distribution panel (core of star topology)
+FDP_OT_MAIN.LC_PANEL LC duplex patch panel section
+FDP_OT_MAIN.SC_PANEL SC duplex patch panel section
+FDP_OT_MAIN.SPLICE Splice tray section (fusion splices)
+FDP_FIELD_A1 Field fibre distribution panel area A1
+FDP_FIELD_B1 Field fibre distribution panel area B1
+FDP_SERVER_RM Server room fibre distribution panel
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
| +COMM_CAB1 Communications cabinet 1
+COMM_CAB1.ROUTER_WAN WAN router (MPLS, leased line, cellular)
+COMM_CAB1.MODEM_4G 4G / 5G router / backup link
+COMM_CAB1.RADIO_MOD Licensed radio modem (SCADA telemetry)
+COMM_CAB1.MEDIA_CNV Fibre / copper media converters
+COMM_CAB1.SERIAL_MUX Serial multiplexer / data concentrator
+COMM_CAB1.SW_WAN WAN-side switch
+COMM_CAB1.VOIP_GW VoIP gateway
+COMM_CAB1.PABX PABX / telephone exchange (small)
+COMM_CAB1.PA_AMP PA system amplifier
+COMM_CAB1.ANT_SPLIT Antenna splitter / combiner
+COMM_CAB2 Communications cabinet 2 (satellite / microwave)
+COMM_CAB2.SAT_MODEM Satellite modem (Ku-band, VSAT)
+COMM_CAB2.MW_MODEM Microwave radio modem
+COMM_CAB2.IDU Indoor unit (IDU) for microwave / satellite
|
Cybersecurity & Demilitarized Zone (DMZ) Equipment
Function Designations
1
2
3
4
5
6
7
8
9
| =CYBER Cybersecurity infrastructure function
=CYBER.FIREWALL Firewall function
=CYBER.DMZ DMZ function
=CYBER.DIODE Data diode function (unidirectional security gateway)
=CYBER.JUMPSERVER Jump server / bastion host function
=CYBER.SIEM SIEM / log management function
=CYBER.IDS Intrusion detection function
=CYBER.PAM Privileged access management function
=NETW.DMZ DMZ network function
|
Location Designations — Cybersecurity
1
2
3
4
5
6
7
8
9
10
11
| +DMZ_CAB DMZ cabinet
+DMZ_CAB.FW_OT_IT OT/IT boundary firewall
+DMZ_CAB.FW_CORP Corporate perimeter firewall
+DMZ_CAB.JUMP_SRV Jump server / bastion host
+DMZ_CAB.DATA_DIODE Data diode (unidirectional gateway)
+DMZ_CAB.SIEM_SRV SIEM server (Splunk, IBM QRadar, AlienVault)
+DMZ_CAB.IDS_SENSOR IDS / IPS sensor (Claroty, Dragos, Nozomi)
+DMZ_CAB.PAM_APPLIANCE PAM appliance (CyberArk, Thycotic)
+DMZ_CAB.PATCH_MGT Patch management server
+DMZ_CAB.AV_SRV AV / endpoint protection update server
+DMZ_CAB.LOG_SRV Centralised log / syslog server
|
Full Tag Examples — Cybersecurity
1
2
3
4
5
6
| =CYBER.FIREWALL+DMZ_CAB.FW_OT_IT-FW_OT_IT1 OT/IT firewall (Fortinet FortiGate 100F)
=CYBER.DIODE+DMZ_CAB.DATA_DIODE-DD1 Data diode (Owl Cyber Defense, Waterfall)
=CYBER.JUMPSERVER+DMZ_CAB.JUMP_SRV-SRV_JUMP1 Jump / bastion server
=CYBER.SIEM+DMZ_CAB.SIEM_SRV-SRV_SIEM1 SIEM server (Splunk Enterprise)
=CYBER.IDS+DMZ_CAB.IDS_SENSOR-IDS_SENSOR1 OT IDS sensor (Claroty / Dragos)
=CYBER.PAM+DMZ_CAB.PAM_APPLIANCE-PAM_APPLN1 PAM appliance (CyberArk)
|
Time Synchronisation (GPS / NTP)
1
2
3
4
5
| +NET_CAB_OT.TIME_SRV NTP server location
+NET_CAB_OT.TIME_SRV.GPS_ANT GPS antenna (roof-mounted, cabled to cabinet)
+RTU_PNL1.COMM.WAN.GPS1 GPS receiver in RTU panel
+SIS_CAB1.COMM.GPS_NTP GPS NTP module in SIS cabinet
+PROT_PNL1.SCADA.GPS_NTP GPS NTP for protection panel (IEC 61850 PTP)
|
Full Tag Examples — Time Sync
1
2
3
4
| =TIME+NET_CAB_OT.TIME_SRV-NTP_GPS_1 GPS-disciplined NTP server (e.g. Meinberg M300)
=TIME+NET_CAB_OT.TIME_SRV.GPS_ANT-ANT_GPS Roof GPS antenna
=TIME+SIS_CAB1.COMM.GPS_NTP-GPS_NTP_SIS1 GPS NTP module in SIS (1ms accuracy)
=TIME+PROT_PNL1.SCADA.GPS_NTP-PTP_MASTER1 IEEE 1588 PTP grandmaster (for IED sync)
|
Control Room Layout — Full Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
| +CTRL_RM Control room (room boundary)
--- Control / PLC Cabinets ---
+CTRL_RM.CAB1 PLC cabinet 1 (CPU A)
+CTRL_RM.CAB1.CPU_A CPU A rack
+CTRL_RM.CAB1.CPU_B CPU B rack (redundant)
+CTRL_RM.CAB1.IO_RACK I/O rack
+CTRL_RM.CAB1.POWER Power supplies
+CTRL_RM.CAB1.COMM Comms modules
+CTRL_RM.CAB1.TERM Terminals
+CTRL_RM.CAB2 PLC cabinet 2 (I/O expansion)
+CTRL_RM.CAB2.IO_RACK1 I/O rack 1
+CTRL_RM.CAB2.IO_RACK2 I/O rack 2
+CTRL_RM.CAB2.TERM Terminals
--- SCADA / Server Cabinets ---
+CTRL_RM.SCADA_CAB SCADA server cabinet
+CTRL_RM.SCADA_CAB.SCADA_PRI Primary SCADA server
+CTRL_RM.SCADA_CAB.SCADA_STB Standby SCADA server
+CTRL_RM.SCADA_CAB.OPC_SRV OPC server
+CTRL_RM.SCADA_CAB.UPS SCADA cabinet UPS
--- Historian Cabinet ---
+CTRL_RM.HIST_CAB Historian cabinet
+CTRL_RM.HIST_CAB.HIST_SRV Historian server
+CTRL_RM.HIST_CAB.APP_SRV Application server
--- Network Cabinets ---
+CTRL_RM.NET_CAB_OT OT network cabinet
+CTRL_RM.NET_CAB_OT.CORE_SW Core OT switch
+CTRL_RM.NET_CAB_OT.FIREWALL OT/IT firewall
+CTRL_RM.NET_CAB_OT.TIME_SRV NTP server
+CTRL_RM.NET_CAB_OT.FIBER_DIST Fibre distribution panel
--- Safety Cabinet ---
+CTRL_RM.SIS_CAB SIS / safety cabinet
+CTRL_RM.SIS_CAB.LOGIC_A SIS logic solver A
+CTRL_RM.SIS_CAB.LOGIC_B SIS logic solver B
+CTRL_RM.SIS_CAB.IO_SAFE Safety I/O rack
+CTRL_RM.SIS_CAB.POWER Safety power supplies
--- UPS Cabinet ---
+CTRL_RM.UPS_CAB UPS cabinet (feeds all control room cabinets)
+CTRL_RM.UPS_CAB.UPS_UNIT UPS main unit
+CTRL_RM.UPS_CAB.BATT1 Battery string 1
+CTRL_RM.UPS_CAB.DIST_BD UPS distribution board
--- Operator Desks ---
+CTRL_RM.DESK1 Operator desk 1
+CTRL_RM.DESK1.PC_HMI1 HMI workstation 1
+CTRL_RM.DESK1.MON1 Monitor 1
+CTRL_RM.DESK1.MON2 Monitor 2
+CTRL_RM.DESK1.ESTOP Desk-mounted e-stop
+CTRL_RM.DESK2 Operator desk 2
+CTRL_RM.DESK2.PC_HMI2 HMI workstation 2
+CTRL_RM.DESK2.MON1 Monitor 1
+CTRL_RM.DESK2.MON2 Monitor 2
+CTRL_RM.ENG_DESK Engineering desk
+CTRL_RM.ENG_DESK.PC_ENG Engineering workstation
--- Display Wall ---
+CTRL_RM.DISPLAY_WALL Video wall (6x panels)
+CTRL_RM.DISPLAY_WALL.CTRL_PROC Display wall processor / controller
|
DCS Control System — Full Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
| Plant: Petrochemical Unit 30 — Reaction Area
=DCS+CTRL_RM.CAB1-FCS_A DCS FCS A (Emerson DeltaV)
=DCS+CTRL_RM.CAB1-FCS_B DCS FCS B (redundant)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_A-AI01_A AI card 01 side A (pressure / flow — 4-20mA HART)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_B-AI01_B AI card 01 side B (redundant)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_A-AO01 AO card 01 (control valves)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_A-DI01 DI card 01 (on/off status)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_A-DO01 DO card 01 (on/off commands)
=DCS.IO+CTRL_RM.CAB1.IO_RACK_A-FF01 FF H1 card (Foundation Fieldbus devices)
=DCS.IO+FLD_CAB_A1.IO_RACK-IM1 Remote I/O interface module area A
=DCS.IO+FLD_CAB_A1.IO_RACK-AI01_R Remote AI card (field-mounted, Ex rated)
=DCS.IO+FLD_CAB_A1.IO_RACK-HART_MUX1 HART multiplexer (field)
=MARSH+MARSH_CAB_A.AI-X_AI_01 AI marshalling terminals (HART loop)
=MARSH+MARSH_CAB_A.BARRIER.AI-Z_AI01 Zener barrier AI channel 01
=DCS.HMI+CTRL_RM.DESK1.PC_HMI1-WS_DCS1 DCS operator workstation 1
=DCS.ENG+CTRL_RM.ENG_DESK.PC_ENG-WS_ENG1 DCS engineering workstation
=DCS.HIST+CTRL_RM.HIST_CAB.HIST_SRV-SRV_HIST Integrated historian server
=DCS.COMM+CTRL_RM.NET_CAB_OT.CORE_SW-SW_DCS_CORE DCS control network switch
|
SCADA / RTU Network — Full Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| SCADA Head End (Control Room):
=SCADA.SERVER+CTRL_RM.SCADA_CAB.SCADA_PRI-SRV_SCADA1 Primary SCADA server
=SCADA.SERVER+CTRL_RM.SCADA_CAB.SCADA_STB-SRV_SCADA2 Hot standby SCADA server
=SCADA.FRONT_END+CTRL_RM.SCADA_CAB.FEP-FEP1 Front-end processor
=SCADA.COMM+CTRL_RM.NET_CAB_OT.ROUTER-RTR_WAN1 WAN router (MPLS)
=HIST+CTRL_RM.HIST_CAB.HIST_SRV-SRV_PI1 PI historian
=SCADA.HMI+CTRL_RM.DESK1.PC_HMI1-WS_SCADA1 Operator HMI
Remote Sites (RTU panels, unmanned):
=RTU+RTU_PNL1.CPU-RTU1_CPU RTU site 01 — pump station 1
=RTU.COMM.WAN+RTU_PNL1.COMM.WAN-MODEM1 RTU 01 4G modem
=RTU+RTU_PNL2.CPU-RTU2_CPU RTU site 02 — pump station 2
=RTU.COMM.WAN+RTU_PNL2.COMM.WAN-RADIO1 RTU 02 radio modem (licensed UHF)
=RTU+RTU_PNL3.CPU-RTU3_CPU RTU site 03 — reservoir
=RTU.COMM.WAN+RTU_PNL3.COMM.WAN-SAT1 RTU 03 satellite modem (remote site)
|
IT / OT Convergence Architecture
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
| LEVEL 4 (Enterprise / IT):
=NETW.IT+SERVER_RM.NET_RACK.CORE_SW_IT-SW_IT_CORE IT core switch
=SERVER+SERVER_RM.RACK_A.SRV1-SRV_ERP ERP server
=SERVER+SERVER_RM.RACK_A.SRV2-SRV_AD Active Directory server
LEVEL 3.5 (DMZ — OT/IT Boundary):
=CYBER.FIREWALL+DMZ_CAB.FW_OT_IT-FW_OT_IT1 OT/IT firewall (Purdue Model L3.5)
=CYBER.JUMPSERVER+DMZ_CAB.JUMP_SRV-SRV_JUMP1 Jump server (remote access)
=CYBER.DIODE+DMZ_CAB.DATA_DIODE-DD_HIST Data diode — historian to IT
LEVEL 3 (Site Operations / SCADA):
=SCADA.SERVER+CTRL_RM.SCADA_CAB.SCADA_PRI-SRV_SCADA SCADA server
=HIST+CTRL_RM.HIST_CAB.HIST_SRV-SRV_HIST Historian server (PI / Ignition)
=SCADA.OPC+CTRL_RM.SCADA_CAB.OPC_SRV-SRV_OPC OPC UA server
LEVEL 2 (Process Control / DCS):
=DCS+CTRL_RM.CAB1-FCS_A DCS controller
=CTRL.PLC+CP1.PLC-CPU1 Standalone PLC
=NETW.OT.CORE+CTRL_RM.NET_CAB_OT.CORE_SW-SW_OT_CORE OT core switch
LEVEL 1 (Field I/O / Remote I/O):
=CTRL.IO+FLD_CAB_A1.IO_RACK-IM1 Remote I/O module
=RTU+RTU_PNL1.CPU-RTU1_CPU Remote RTU
LEVEL 0 (Field devices):
=INST+FIELD-FT101 Flow transmitter
=MOTOR.DOL+MCC1.M01-KM1 Motor starter
|
PLC / Controller Devices
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| CPU_A / CPU_B PLC CPU (A = primary, B = standby)
PM1 PLC power module
IM1 Interface module (expansion rack)
DI01..n Digital input modules
DO01..n Digital output modules
AI01..n Analog input modules
AO01..n Analog output modules
RTD01 RTD/thermocouple module
CNT01 Counter/encoder module
SYNC_MOD Redundancy sync module
CM_PN PROFINET comms module
CM_PB PROFIBUS comms module
CM_485 RS485/Modbus module
CM_ETH Ethernet comms module
CM_IEC104 IEC 60870-5-104 comms module
|
Server / IT Devices
1
2
3
4
5
6
7
8
9
10
11
12
| SRV_SCADA_PRI Primary SCADA server
SRV_SCADA_STB Standby SCADA server
SRV_HIST Historian server
SRV_OPC OPC server
SRV_APP Application server
SRV_WEB Web server
SRV_DR Disaster recovery server
SRV_ENG Engineering server
ESXI_HOST VMware ESXi hypervisor host
NAS1 / NAS2 Network attached storage
SAN_ARRAY SAN storage array
TAPE_LIB Tape library
|
Network Devices
1
2
3
4
5
6
7
8
9
10
11
| SW_CORE_OT Core OT switch
SW_DIST_OT1 OT distribution switch
SW_PN_FIELD PROFINET field switch
SW_CORE_IT Core IT switch
SW_MGMT Out-of-band management switch
RTR_WAN WAN router
FW_OT_IT OT/IT firewall
FW_CORP Corporate perimeter firewall
FEP1 Front-end processor
FC_FIBER1 Fibre media converter
AP_INDUS1 Industrial WiFi access point
|
Cybersecurity / Communications
1
2
3
4
5
6
7
8
9
10
11
| FW_OT_IT OT/IT boundary firewall
DD1 Data diode
SRV_JUMP Jump / bastion server
SRV_SIEM SIEM server
IDS_SENSOR OT IDS/IPS sensor
PAM_APPLN PAM appliance
NTP_GPS GPS-disciplined NTP server
ANT_GPS GPS antenna
MODEM_4G 4G/LTE modem
RADIO1 Licensed radio modem
SAT_MODEM Satellite modem
|
Common Mistakes
| ❌ Wrong | ✅ Correct | Reason |
|---|
=SERVER_1 | +SERVER_RM.RACK_A.SRV1 | Server 1 is a location/device, not a function |
+SCADA | =SCADA and +CTRL_RM.SCADA_CAB | SCADA is a function; cabinet is the location |
+NETWORK | +NET_CAB_OT or +NET_CAB_IT | Network is a function =NETW; the cabinet is the location |
=PLC1 | +CP1.PLC with =CTRL.PLC | PLC1 is a device -CPU1, not a function |
Leaving + blank for servers | +SERVER_RM.RACK_A.SRVn | Blank location — server disappears from location-filtered reports |
+CONTROL_ROOM for everything | Break down to cabinet level +CTRL_RM.CAB1 | Too broad — entire control room merges in all reports |
| Mixing IT rack convention with PLC panel convention | Define rules upfront for automation vs IT sections | Inconsistency breaks rack layout drawings and cable reports |
+PLC_CAB and +PLCCAB and +PLC CAB for same cabinet | +PLC_CAB — one convention, zero spaces | Three different names = three different locations in reports |
=CTRL+SERVER_RM | =SCADA.SERVER+SERVER_RM.RACK_A | Function and location both need to be specific |
| Not distinguishing OT and IT network cabinets | +NET_CAB_OT / +NET_CAB_IT | OT and IT are different cybersecurity zones — must be separated |
Expert Tips
1. Layer your = function by ISA/Purdue level
Level 0 = field, Level 1 = I/O / RTU, Level 2 = PLC / DCS, Level 3 = SCADA / Historian, Level 3.5 = DMZ, Level 4 = IT / ERP. Use this as your = hierarchy. It maps directly to cybersecurity zone documentation.
2. Redundant systems need paired + locations
+CP1.CPU_A and +CP1.CPU_B for redundant CPUs. +UPS_RM.UPS_OT and +UPS_RM.UPS_IT for separate UPS systems. Separate + locations = separate terminal diagrams = correct commissioning checklists.
3. Give every server its own + sub-location
+SERVER_RM.RACK_A.SRV1 not just +SERVER_RM.RACK_A. Rack-level granularity means your cable schedules, power circuits, and network port assignments all filter correctly.
4. Use +FIELD or +FLD_CAB_XX for all remote I/O drops
Never leave remote I/O cabinets on the same + location as the main PLC cabinet. Each remote I/O drop is a physically separate enclosure and deserves its own + location.
5. Separate OT and IT + locations — always
+NET_CAB_OT ≠ +NET_CAB_IT. Mixing them in EPLAN will mix your OT and IT cable schedules, which matters enormously for cybersecurity documentation (ISA/IEC 62443).
6. Safety system cabinets must have their own + location
+SIS_CAB1 separate from +CTRL_RM.CAB1. Safety I/O terminals, cable schedules, and wiring separation documents all depend on the SIS having its own distinct location.
7. Communications modules deserve their own + sub-section
+CP1.COMM separate from +CP1.PLC. When commissioning a PROFINET ring or diagnosing a Modbus fault, having comms modules filtered separately saves hours.
8. Document WAN / telemetry links with their own + location
+RTU_PNL1.COMM.WAN for the modem / radio section. Telecoms engineers who commission the WAN link need to find all WAN components in one place on the drawing.
9. Use +CTRL_RM.DESK1 for operator workstations — not the server rack
Operator PCs, monitors, and KVM receivers are physically at the desk, not in the server rack. Separate + for desk vs rack keeps installation drawings and cable schedules accurate.
10. Always tag GPS antennas, fibre runs, and battery backups
+NET_CAB_OT.TIME_SRV.GPS_ANT for the GPS antenna. +RTU_PNL1.BATT.BATT1 for the backup battery. These are real components with real cable connections that must appear in the cable schedule and BOM.
Based on IEC 61131 | IEC 61512 | IEC 61511 | IEC 62443 | IEC 60870 | IEC 61968 | ISA-95 | ISA-99 / IEC 62443 | NIST SP 800-82 | Purdue Reference Model | IEC 61850 | IEEE 1588 Expert conventions for system integrators, automation engineers, DCS/SCADA designers, IT/OT convergence engineers, and cybersecurity-aware panel builders
