Isa Standards | Skills Pool
Isa Standards ISA-5.1 tag naming, ISA-88 batch control, ISA-95 enterprise integration, ISA-18.2 alarm management, and ISA-101 HMI standards reference. Use when working with instrument tags, naming conventions, or plant hierarchy.
claude-dev-suite 11 stars Mar 15, 2026 Occupation Categories Lab Tools ISA Standards Reference for Industrial Automation
ISA-5.1: Instrumentation Symbols and Identification
Tag Number Structure
[Area].[Functional ID].[Loop Number][Suffix]
Functional ID = [First Letter: measured variable] + [Succeeding Letters: function/modifier]
Examples from project:
11301.PDI.076A = Area 11301, Pressure Differential Indicator, loop 076, suffix A
11301.SALL.020A = Area 11301, Speed Alarm Low-Low, loop 020, suffix A
11301.FIC.056A = Area 11301, Flow Indicating Controller, loop 056, suffix A
11301.CLWW.1A1 = Area 11301, Conveyor (equipment tag), unit 1A1
First Letter (Measured/Initiating Variable)
Letter Variable As Succeeding Letter
Quick Install
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Updated Mar 15, 2026
Occupation Analysis (pH, O2, conductivity)
B Burner, Combustion User's choice
D User's Choice Differential
E Voltage (EMF) Sensor/Element
G User's Choice Glass/Gauge
I Current (Electrical) Indicate
K Time, Schedule Time Rate of Change
M User's Choice Middle/Intermediate
N User's Choice User's choice
O User's Choice Orifice/Restriction
P Pressure, Vacuum Point (test)
Q Quantity Totalize/Integrate
S Speed, Frequency Switch/Safety
U Multivariable Multifunction
V Vibration, Mechanical Analysis Valve/Damper
X Unclassified Unclassified
Y Event, State, Presence Relay/Compute
Z Position, Dimension Actuator/Driver
Common Tag Combinations Flow:
FE (element), FT (transmitter), FI (indicator), FIC (indicating controller), FCV (control valve), FAH (alarm high), FAL (alarm low), FAHH (alarm high-high), FALL (alarm low-low), FSH (switch high), FSL (switch low), FQI (quantity indicator/totalizer), FR (recorder)
Level:
LT, LI, LIC, LCV, LAH, LAL, LAHH, LALL, LSH, LSL, LSHH, LSLL, LG (gauge glass)
Pressure:
PT, PI, PIC, PCV, PAH, PAL, PAHH, PALL, PDI (differential indicator), PDIC, PDT, PSH, PSL, PSV (safety valve), PG (gauge)
Temperature:
TE (element), TT, TI, TIC, TCV, TAH, TAL, TSH, TSL, TR (recorder), TW (thermowell)
Position/Valve:
ZT (position transmitter), ZI, ZIC, ZAH (open alarm), ZAL (closed alarm), ZSH (open switch), ZSL (closed switch), ZSHH, ZSLL
Speed:
ST, SI, SIC, SAH, SAL, SAHH, SALL
Current (Electrical):
II (current indicator), IIC (current indicating controller), IAH, IAHH
Vibration:
VI (vibration indicator), VAH, VAHH
Code Equipment Type Example K Kiln/Equipment 11301.K.9 N Pump 11301.N.3A F Feeder 11301.F.4 WG Weighing belt 11301.WG.8 SR Screen/Separator 11301.SR.9A CL/CLWW Conveyor (weigh) 11301.CLWW.1A1 KC Crusher 11301.KC.F.4 EL Elevator 11301.EL.AA Z Silo/Storage 11301.Z.2A
Tag Naming Variations by Region/Vendor Convention Format Example ISA Pure FIC-101A American standard European (this project) 11301.FIC.101A Area.Function.LoopSuffix Siemens/KKS +FIC101A= German power plant standard DeltaV path FIC-101A/PV With parameter path Honeywell FIC101A.PV With point parameter
ISA-88: Batch Control (S88)
Physical Model Hierarchy Enterprise
+-- Site
+-- Area
+-- Process Cell
+-- Unit
+-- Equipment Module (EM)
+-- Control Module (CM)
Mapping to DCS Engineering ISA-88 Concept DCS Implementation Example Control Module Function block instance Motor block, valve block, PID loop Equipment Module Sequence/SFC Reactor filling sequence Unit Process unit with sequences Reactor R-101 Process Cell Group of units Production Line A
Control Module Types (Standard Templates)
Motor CM : Start/Stop, feedback, interlock, mode selectionOn/Off Valve CM : Open/Close, position feedback, interlockModulating Valve CM : Analog output, position feedback, PID outputPID Loop CM : AI input, PID algorithm, AO outputAnalog Input CM : Scaling, filtering, alarm limitsDigital Input CM : State detection, alarm on state
ISA-95: Enterprise-Control Integration
Equipment Hierarchy (extends ISA-88 upward) Enterprise > Site > Area > Work Center > Work Unit
Relevance to Tag Naming Tags should encode the hierarchy. Example: 11301.FIC.056A
11301 = Area identifier (maps to ISA-95 Area)FIC = Function (ISA-5.1)056 = Loop number (unique within area)A = Suffix (parallel instance)
ISA-18.2: Alarm Management
Alarm Priority Distribution (Guideline) Priority Percentage Response Time Critical (1) ~5% Immediate High (2) ~15% < 5 minutes Medium (3) ~30% < 30 minutes Low (4) ~50% Next round
Alarm Tag Properties for Bulk Engineering Each alarm tag requires: Priority, Setpoint (limit), Deadband, On-delay, Off-delay, Alarm class (Process/Safety/Equipment), Shelving capability.
Naming Convention for Alarms {Area}.{Variable}{AlarmType}.{Loop}{Suffix}
PAH = Pressure Alarm High
PAHH = Pressure Alarm High-High
PAL = Pressure Alarm Low
PALL = Pressure Alarm Low-Low
In Freelance EAM: XA1 = primary alarm, XA2 = secondary alarm
ISA-101: Human Machine Interfaces
Display Hierarchy Level Name Content Quantity 1 Plant Overview Entire plant, KPIs 1-3 2 Area Overview One process area 5-20 3 Unit Detail One unit operation 20-100 4 Faceplate/Detail One control loop Auto-generated
Gray backgrounds (not black)
Analog representations (bar graphs, sparklines, not just numbers)
Minimal animation (no rotating equipment, no flowing pipes)
Color reserved for abnormal states (alarms, deviations)
Consistent navigation (plant hierarchy)
Situational awareness focus