Tag Naming Conventions

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David Farris

I am looking for a well documented tag naming convention for Process Control. I am somewhat familiar with commonly used tags such as ZSCxxxx and ZSOxxxx as limit switch indicators. I think this is an ISA standard, but am unable to find a document that addresses the standard.

Does any one know of such documentation or even if it exist?

Thanks,
David
 
David

I am not sure this is what you requested but here is the list of GE BASIC CONTROL DEVICE FUNCTION NUMBERS AMERICAN NATIONAL STANDARDS INSTITUTE<pre>
1 MASTER ELEMENT
2 SEQUENCE TIMER
3 CHECKING RELAY
4 MASTER RELAY
5 STOPPING DEVICE
6 STARTING CIRCUIT BREAKER
8 CONTROL POWER DISCONNECTING DEVICE
10 UNIT SEQUENCE SWITCH
12 OVERSPEED DEVICE
13 SYNCHRONOUS SPEED DEVICE
14 SPEED RELAY
15 SPEED or FREQUENCY MATCHING DEVICE
18 ACCELERATING or DECELERATING DEVICE
20 SOLENOID VALVE
21 DISTANCE RELAY
23 TEMPERATURE CONTROL DEVICE
25 SYNCHRONISM CHECK DEVICE
26 TEMPERATURE SENSING DEVICE
27 UNDERVOLTAGE
28 FLAME DETECTOR
30 ANNUNCIATOR RELAY
32 DIRECTIONAL POWER RELAY
33 POSITION SWITCH
34 MASTER SEQUENCE DEVICE
37 UNDERCURRENT or UNDERPOWER RELAY
38 BEARING PROTECTIVE DEVICE
39 MECHANICAL CONDITION MONITOR
40 FIELD RELAY
41 FIELD CIRCUIT BREAKER
43 MANUAL TRANSFER or SELECTOR DEVICE
45 ATMOSPHERIC CONDITION MONITOR
46 REVERSE-PHASE or PHASE-BALANCE CURRENT RELAY
47 PHASE-SEQUENCE VOLTAGE RELAY
48 INCOMPLETE SEQUENCE RELAY
49 MACHINE or TRANSFORMER THERMAL RELAY
50 INSTANTANEOUS OVERCURRENT or RATE-of-RISE RELAY
51 AC TIME OVERCURRENT RELAY
52 AC CIRCUIT BREAKER or CONTACTOR
55 POWER FACTOR RELAY
57 SHORT CIRCUITING or GROUNDING DEVICE
59 OVERVOLTAGE RELAY
60 VOLTAGE or CURRENT BALANCE RELAY
62 STOPPING or OPENING TIMER RELAY
63 LIQUID or GAS PRESSURE or VACUUM
64 GROUND PROTECTIVE RELAY
65 GOVERNOR
66 NOTCHING or JOGGING DEVICE
67 AC DIRECTIONAL OVERCURRENT RELAY
68 BLOCKING RELAY
69 PERMISSIVE CONTROL DEVICE
70 ELECTRICALLY OPERATED RHEOSTAT
71 LIQUID or GAS LEVEL RELAY
72 DC CIRCUIT BREAKER or CONTACTOR
75 POSITION CHANGING MECHANISM
77 PULSE TRANSMITTER
80 LIQUID or GAS FLOW RELAY
81 FREQUENCY RELAY
82 DC RECLOSING RELAY
83 AUTOMATIC SELECTIVE CONTROL or TRANSFER RELAY
84 OPERATING MECHANISM
85 CARRIER or PILOT-WIRE RECEIVER RELAY
86 LOCK-OUT RELAY
87 DIFFERENTIAL PROTECTIVE RELAY
88 AUXILIARY MOTOR or MOTOR GENERATOR
89 LINE SWITCH
90 REGULATING DEVICE
91 VOLTAGE DIRECTIONAL RELAY
93 FIELD-CHANGING CONTACTOR
94 TRIPPING or TRIP-FREE RELAY
96 TRANSDUCER</pre>
 
Hi David

Our company use the AKZ - Anlagenstruktur -kennzeichen Objektklasse. This is a 4 level structure as follows;

level 1 - Complex (plant)
level 2 - Plant Area
level 3 - Sub-Area
level 4 - E&I Item/ tag number

So for example a long tag name (all levels) of GERMDI-V400-RF41-F1101 would mean in Germany, in an MDI Plant in the Plant area V400, there is sub-Area RF41(lets say Refrigeration unit). In this unit there is a flow meter F1101 (that is on a line apart of the compressor K4111).

Of course this tagging is too long but for local purposes, we know that the plant facility is in Germany and is an MDI facility, therefore level 1 is ignored. We also assume there are 100, 200, etc..Plant Areas, but as this is the V400 area therefore the Refrig unit is RF41(other areas become lettered eg. TF41, tank farm etc.. by switching to letters we can allow for 9 units-which is highly unlikely) and therefore we also can now ignore V400. Which only leaves the tag F1101 as the flowmeter. But how do we know the related equipment?

We use short name 41F1101.

41 from RF41
F for flow
11 because compressor 4111
01 is a number (the first or maybe last flowmeter)

Of course we have a huge document detailing this as a Werknorm and it can be complicated but as you can see it is structured for global companies)

For the ISA tagging, I would recommend the ISO 3511 as the letters are usually depicted on P&ID's from this standard.

Hope this helps
Gray
 
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