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Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
ANSI/ISA-5.1-2009
- 100 -
Table A.2 — Allowable letter/number combinations for loop numbering schemes
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. Scheme 1 Scheme 2 First Letters (1) Scheme 3 Scheme 4 Scheme 5 Parallel (2) Serial (2) Meas / Init Variable Meas / Init Variable Measured/Initiating Variables First Letters w/o Mod. w/Mod. w/o Mod. w/Mod. w/ and w/o Modifiers (4b) A Analysis A-*01 A-*01 A-*01 A-*01 A-*01 AZ Analysis(SIS) (3) AZ-*01 AZ-*02 AZ-*02 B-*01 B Burner, Combustion B-*01 B-*03 B-*02 B-*01 BZ-*04 BZ Burner, Combustion(SIS) (3) BZ-*01 BZ-*02 C User’s Choice (4a) C-*01 C-*01 C-*01 C-*03 C-*05 D User’s Choice (4a) D-*01 D-*01 D-*01 D-*04 D-*06 E-*01 E Voltage E-*01 E-*07 E-*05 E-*01 EZ-*08 EZ Voltage(SIS) (3) EZ-*01 E-*02 F-*01 F Flow, Flow Rate F-*01 F-*09 FF Flow Ratio FF-*01 FF-*10 FF-*02 F-*01 F-*06 FQ Flow Total FQ-*01 FQ-*11 FQ-*03 FS Flow Safety (5) FS-*01 FS-*12 FS-*04 FZ Flow(SIS) (3) FZ-*01 FZ-*13 FZ-*05 G User’s Choice (4a) G-*01 G-*01 G-*01 G-*07 G-*14 H-*01 H Hand H-*01 H-*15 H-*08 H-*01 HZ-*16 HZ Hand(SIS) (3) HZ-*01 HZ-*01 I-*01 I Current I-*01 I-*17 I-*09 I-*01 IZ-*18 IZ Current(SIS) (3) IZ-*01 IZ-*02 J-*01 J Power J-*01 J-*19 J-*10 J-*01 JQ Power Totalize JD-*01 JD-*20 JD-*02 JZ-*21 JZ Power(SIS) (3) JZ-*01 JZ-*03 K-*01 K Time, Schedule K-*01 K-*22 K-*11 K-*01 KQ-*23 KQ Time Totalize KQ-*01 KQ-*02 L-*01 L Level L-*01 L-*24 L-*12 L-*01 LZ-*25 LZ Level(SIS) (3) LZ-*01 LZ-*02 M User’s Choice (4a) M-*01 M-*01 M-*01 M-*13 M-*26 N User’s Choice (4a) N-*01 N-*01 N-*01 N-*14 N-*27 O User’s Choice (4a) O-*01 O-*01 O-*01 O-*15 O-*28 P-*01 P Pressure P-*01 P-*29 PD Pressure Differential PD-*01 PD-*30 PD-*02 PF Pressure Ratio PF-*01 PF-*31 PF-*03 P-*01 P-*16 PJ Pressure Scan PJ-*01 PJ-*32 PJ-*04 PK Pressure Rate of Change PK-*01 PK-*33 PK-*05 PS Pressure Safety (5) PS-*01 PS-*34 PS-*06 PZ Pressure(SIS) (3) PZ-*01 PZ-*35 PZ-*07 Q-*01 Q Quantity Q-*01 Q-*36 Q-*17 Q-*01 QQ-*37 QQ Quantity Totalize QQ-*01 QQ-*02 R-*01 R Radiation R-*01 R-*38 R-*18 R-*01 RQ Radiation Totalize RQ-*01 RQ-*39 RQ-*02 RZ-*40 RZ Radiation(SIS) (3) RZ-*01 RZ-*03 S-*01 S Speed, Frequency S-*01 S-*41 S-*19 S-*01 SZ-*42 SZ Speed(SIS) (3) SZ-*01 SZ-*02
Scheme 6
Scheme 7 Scheme 8 Parallel (2) Serial (2) Parallel (2) Serial (2) Measured/Initiating Variable First Letters w/o Modifiers w/Modifiers A-*01 A-*01 A-*01 AZ-*02 AZ-*02 B-*03 B-*01 B-*01 BZ-*02 BZ-*04 C-*05 C-*02 C-*03 D-*06 D-*03 D-*04 E-*07 E-*05 E-*04 E-*08 EZ-*06 F-*01 F-*09 FF-*10 FF-*02 F-*01 FQ-*11 FQ-*03 FS-*12 FS-*04 FZ-*13 FZ-*05 G-*14 G-*05 G-*07 H-*15 H-*08 H-*06 HZ-*09 HZ-*16 I-*17 I-*10 I-*07 IZ-*11 IZ-*18 J-*19 J-*12 J-*08 JD-*20 JQ-*13 JZ-*14 JZ-*21 K-*22 K-*15 K-*09 KQ-*16 KQ-*23 L-*01 L-*24 L-*01 LZ-*25 LZ-*02 M-*26 M-*10 M-*17 N-*27 N-*11 N-*18 O-*12 O-*19 O-*28 P-*29 P-*01 PD-*30 PD-*02 PF-*31 PF-*03 P-*01 PJ-*32 PJ-*04 PK-*33 PK-*05 PS-*34 PS-*06 PZ-*35 PZ-*07 Q-*36 Q-*20 Q-*13 QQ-*21 QQ-*37 R-*38 R-*22 R-*14 RQ-*39 RQ-*23 RZ-*24 RZ-*40 S-*41 S-*25 S-*15 SZ-*42 SZ-*26
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Scheme 9 Parallel (2) Serial (2) First Letters A-*01 AZ-*01
F-*01 FF-*01 FQ-*01 FS-*01 FZ-*01
L-*01 LZ-*01
P-*01 PD-*01 PF-*01 PJ-*01 PK-*01 PS-*01 PZ-*01
B-*01 BZ-*02 C-*03 D-*04 E-*05 EZ-*06
G-*07 H-*08 HZ-*09 I-*10 IZ-*11 J-*12 JQ-*13 JZ-*14 K-*15 KQ-*16 M-*17 N-*18 O-*19
Q-*20 QQ-*21 R-*22 RQ-*23 RZ-*24 S-*25 SZ-*26
ANSI/ISA-5.1-2009
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Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
- 101 -
Table A.2 — Allowable letter/number combinations for loop numbering schemes
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. First Letters (1) Scheme 3 Scheme 4 Scheme 5 Scheme 1 Scheme 2 Parallel (2) Serial (2) Meas / Init Variable Meas / Init Variable Measured/Initiating Variables First Letters w/o Mod. w/Mod. w/o Mod. w/Mod. w/ and w/o Modifiers (4b) T-*01 T Temperature T-*01 T-*43 TD Temperature Differential TD-*01 TD-*44 TD-*02 TF Temperature Ratio TF-*01 TF-*45 TF-*03 T-*01 T-*20 TJ Temperature Scan TJ-*01 TJ-*46 TJ-*04 TK Temperature Rate of Change TK-*01 TK-*47 TK-*05 TS Temperature Safety (5) TS-*01 TS-*48 TS-*06 TZ Temperature(SIS) (3) TZ-*01 TZ-*49 TZ-*07 U-*01 U Multivariable U-*01 U-*50 U-*21 U-*01 UJ Multivariable Scan UJ-*01 UJ-*51 UJ-*02 UZ-*52 UZ Multivariable(SIS) (3) UZ-*01 UZ-*03 V Vibration, Machinery Analysis V-*01 V-*01 V-*53 VZ Vibration(SIS) (3) (6a) VZ-*02 VZ-*01 VZ-*54 VX Vibration X-Axis VX-*03 VX-*01 VX-*55 VY Vibration Y-Axis VY-*04 VY-*01 VY-*56 V-*01 V-*22 VZ Vibration Z-Axis VZ-*05 VZ-*01 VZ-*57 VZX Vibration X-Axis(SIS) (3) (6b) VZX-*06 VZX-*01 VZX-*58 VZY Vibration Y-Axis(SIS) (3) (6b) VZY-*07 VZY-*01 VZY-*59 VZZ Vibration Z-Axis(SIS) (3) (6b) VZZ-*08 VZZ-*01 VZZ-*60 W Weight, Force W-*01 W-*61 W-*01 WZ Force(SIS) (3) (6a) WZ-*01 WZ-*62 WZ-*02 WD Weight Differential WD-*01 WD-*63 WD-*03 WF Weight Ratio WF-*01 WF-*65 WF-*04 WK Weight Loss (Gain) WK-*01 WK-*66 WK-*05 WQ Weight Total WQ-*01 WQ-*67 WQ-*06 W-*23 W-*01 WX Force X Axis WX-*01 WX-*68 WX-*07 WY Force Y Axis WY-*01 W-Y*69 WY-*08 WZ Force Z Axis WZ-*01 WZ-*70 WZ-*09 WZX Force X Axis(SIS) (3) (6b) WZX-*01 WZX-*71 WZ-*10 WZY Force Y Axis(SIS) (3) (6b) WZY-*01 WZY-*72 WZX-*11 WZZ-*73 WZZ Force Z Axis(SIS) (3) (6b) WZZ-*01 WZY-*12 X Unclassified X-*01 X-*01 X-*01 X-*24 X-*74 Y-*01 Y Event, State, Presence Y-*01 Y-*75 Y-*25 Y-*01 YZ-*76 YZ Event, State(SIS) (3) YZ-*01 YZ-*02 Z Position, Dimension Z-*01 Z-*01 Z-*77 Z-*26 Z-*01 ZZ-*78 ZZ Position(SIS) (3) (6a) ZZ-*02 ZZ-*01 ZX Position X Axis ZX-*03 ZX-*01 ZX-*79 ZY Position Y Axis ZY-*01 ZY-*80 ZY-*04 ZZ Position Z Axis ZZ-*05 ZZ-*01 ZZ-*81 ZZX Position X Axis(SIS) (3) (6b) ZZX-*06 ZZX-*01 ZZX-*82 ZZY Position Y Axis(SIS) (3) (6b) ZZY-*07 ZZY-*01 ZZY-*83 ZZZ Position Z Axis(SIS) (3) (6b) ZZZ-*08 ZZZ-*01 ZZZ-*84 ZD Position Difference ZD-*09 ZD-*01 ZD-*85 ZDX Position Difference X Axis ZDX-*10 ZDX-*01 ZDX-*86
Scheme 6
Scheme 7 Scheme 8 Parallel (2) Serial (2) Parallel (2) Serial (2) Measured/Initiating Variable First Letters w/o Modifiers w/Modifiers T-*43 T-*01 TD-*44 TD-*02 TF-*45 TF-*03 T-*01 TJ-*46 TJ-*04 TK-*47 TK-*05 TS-*48 TS-*06 TZ-*49 TZ-*06 U-*50 U-*27 U-*16 UJ-*51 UJ-*28 UJ-*29 UZ-*52 V-*53 V-*30 VZ-*54 VZ-*31 VX-*55 VX-*32 VY-*56 VY-*33 V-*17 VZ-*57 VZ-*34 VZX-*58 VZX-*35 VZY-*59 VZY-*36 VZZ-*60 VZZ-*37 W-*61 W-*38 WZ-*62 WZ-*39 WD-*63 WD-*40 WF-*65 WF-*41 WK-*66 WK-*42 WQ-*67 WQ-*43 W-*18 WX-*68 WX-*44 W-Y*69 WY-*45 WZ-*70 WZ-*46 WZX-*71 WZX-*47 WZY-*72 WZY-*48 WZZ-*49 WZZ-*73 X-*74 X-*19 X-*50 Y-*75 Y-*51 Y-*20 YZ-*52 YZ-*76 Z-*21 Z-*77 Z-*53 ZZ-*78 ZX-*54 ZX-*79 ZY-*55 ZY-*80 ZZ-*56 ZZ-*81 ZZ-*57 ZZX-*82 ZZX-*58 ZZY-*83 ZZY-*59 ZZZ-*84 ZZZ-*60 ZD-*85 ZD-*61 ZDX-*86 ZDX-*62
Scheme 9 Parallel (2) Serial (2) First Letters T-*01 TD-*01 TF-*01 TJ-*01 TK-*01 TS-*01 TZ-*06
U-*27 UJ-*28 UJ-*29 V-*30 VZ-*31 VX-*32 VY-*33 VZ-*34 VZX-*35 VZY-*36 VZZ-*37 W-*38 WZ-*39 WD-*40 WF-*41 WK-*42 WQ-*43 WX-*44 WY-*45 WZ-*46 WZX-*47 WZY-*48 WZZ-*49 X-*50 Y-*51 YZ-*52 Z-*53 ZX-*54 ZY-*55 ZZ-*56 ZZ-*57 ZZX-*58 ZZY-*59 ZZZ-*60 ZD-*61 ZDX-*62
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- 102 --`,,```,,,,````-`-`,,`,,`,`,,`---
Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
ANSI/ISA-5.1-2009
Table A.2 — Allowable letter/number combinations for loop numbering schemes Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. First Letters (1) Scheme 3 Scheme 4 Scheme 5 Scheme 1 Scheme 2 Parallel (2) Serial (2) Meas / Init Variable Meas / Init Variable Measured/Initiating Variables First Letters w/o Mod. w/Mod. w/o Mod. w/Mod. w/ and w/o Modifiers (4b) ZDY Position Difference Y Axis ZDY-*11 ZDY-*01 ZDY-*87 ZDZ Position Difference Z Axis ZDZ-*12 ZDZ-*01 ZDZ-*88
Scheme 6
Scheme 7 Scheme 8 Parallel (2) Serial (2) Parallel (2) Serial (2) Measured/Initiating Variable First Letters w/o Modifiers w/Modifiers ZDY-*87 ZDY-*63 ZDZ-*88 ZDZ-*64
Scheme 9 Parallel (2) Serial (2) First Letters ZDY-*63 ZDZ-*64
Not for Resale
Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
- 103 -
ANSI/ISA-5.1-2009
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Table A.3.1 — Allowable succeeding letter combinations for readout/passive functions (1) (4b)
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. A B First Letters (2) E Absolute Function Deviation User’s Primary Alarm Modifier Choice Alarm Measured/Initiating Variables Element A [*] (3) (4d) AD (4a) w/ and w/o Modifiers [*] = A Analysis AA[*] AAD[*] AE AZ Analysis(SIS)) AZA[*] NA AZE Alarm B Burner, Combustion BA[*] BAD[*] BE and other BZ Burner, Comb(SIS) BZA[*] NA BZE Function C User’s Choice Modifier D User’s Choice E Voltage EA[[*] EAD[*] EE None EZ Voltage(SIS) EZA[*] NA EZE F Flow, Flow Rate FA[*] FAD[*] FE High-High FF Flow Ratio FFA[* FFAD[*] FFE HH FQ Flow Total FQA[*] FQAD[*] FQE High FS Flow Safety NA NA NA H FZ Flow(SIS) FZA[*] NA FZE Middle G User’s Choice M H Hand HA[*] NA NA Low HZ Hand(SIS) HZA[*] NA NA L I Current IA[*] IAD[*] IE Low-Low IZ Current(SIS) IZA[*] NA IZE LL J Power JA[*] JAD[*] JE JQ Power Totalize JQA[*] NA JE Open JZ Power(SIS) JZA[*] NA JZE O K Time, Schedule KA[*] KAD[*] NA Close KQ Time Totalize KQA[*] NA NA C L Level LA[*] LAD[*] LE LZ Level(SIS) LZA[*] NA LZE Run M User’s Choice R N User’s Choice Stop O User’s Choice S P Pressure PA[*] PAD[*] PE PD Pressure Differential PDA[*] PDAD[*] PDE Unclassified PF Pressure Ratio PFA[*] PFAD[*] PE X PJ Pressure Scan PJA[*] NA PE PK Pressure Rate of Change PKA[*] PKAD[*] PE PS Pressure Safety NA NA PSE (6) PZ Pressure(SIS) PZA[*] NA PZE Q Quantity QA[*] QAD[*] QE QQ Quantity Totalize QQA[*] NA QE R Radiation RA[*] RAD[*] RE RQ Radiation Totalize RQA[*] NA RE RZ Radiation(SIS) RZA[*] NA RZE S Speed, Frequency SA[*] SAD[*] SE NA SZ Speed(SIS) SZA[*] SZE
G
I
Gauge, Indicate Glass
L Light
NA NA BG NA
AI AZI BI BZI
AL AZL BL BZL
EG NA FG NA NA NA NA
EI EZI FI FFI FQI NA FZI
EL EZL FL NA NA NA FZL
NA NA IG NA JG NA NA KG KQG LG NA
HI NA II IZI JI JQI JZI KI KQI LI LZI
NA NA IL IZL JL
PG (5) PDG (5) NA NA NA NA NA NA NA RG NA NA SG NA
PI PDI PFI NA PKI NA PZI QI QQI RI RQI RZI SI SZI
N User’s Choice (4a)
O P Q R Orifice, Point Integrate, Record Restrict- (Test Total ion Conn.) NA AP NA AR NA AZP NA AZR NA BP NA BR NA BZP NA BZR
W
X
Well, Probe
Unclassified
AW AZW BW BZW
AX NA BX NA
EO NA FO NA NA NA NA
EP EZP FP NA NA NA FZP
NA NA FQ NA NA NA NA
ER EZR FR FFR FQR NA FZR
NA EZW NA NA NA NA FZW
EX NA FX FFX FQX NA NA
JZL KL KQL LL LZL
NA NA IO NA JO NA NA NA NA NA NA
NA NA IP IZP JP JP JZP NA NA LP LZP
NA NA NA NA JQ NA NA KQ NA NA NA
HR HZR IR BZR JR JQR JZR KR KQR LR BZR
NA NA NA BZW NA NA NA NA NA LW BZW
HX NA IX NA JX JQX NA KX KQX LX NA
PL PDL NA NA PKL NA PZL QL QQL RL RQL RZL SL SZL
NA NA NA NA NA NA NA NA NA NA NA NA NA NA
PP NA NA NA NA NA PZP NA NA RP NA RZP SP SZP
NA NA NA NA NA NA NA QQ NA RQ NA NA NA NA
PR PDR PFR PJR PKR NA BZR QR QQR RR RQR BZR SR BZR
NA NA NA NA NA NA BZW NA NA NA NA BZW NA BZW
PX PDX PFX NA PKX NA NA QX QQX RX RQX NA SX NA
NA
NA
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
//^:^^#^~^^"#@::"~^$:~@""
Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
ANSI/ISA-5.1-2009
- 104 -
Table A.3.1 — Allowable succeeding letter combinations for readout/passive functions (1) (4b)
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. First Letters (2) E A B Absolute Function Deviation User’s Primary Alarm Modifier Choice Alarm Measured/Initiating Variables Element A [*] (3) (4d) AD (4a) w/ and w/o Modifiers T Temperature TA[*] TAD[*] TE TD Temperature Differential TDA[*] TDAD[*] TDE TF Temperature Ratio TFA[*] TFAD[*] TE TJ Temperature Scan TJA[*] NA TJE TK Temperature Rate of TKA[*] TKAD[*] TE TS Temperature Safety NA NA TSE (6) TZ Temperature(SIS) TZA[*] NA TZE U Multivariable UA[*] NA NA UJ Multivariable Scan UJA[*]] NA NA UZ Multivariable(SIS) UZA[*] NA UZE V Vibr., Mach. Analysis VA[*] VAD[*] VE VZ Vibration(SIS) VZA[*] NA VZE VX Vibration X-Axis VXA[*] VXAD[*] VXE VY Vibration Y-Axis VYA[*] VYAD[*] VYE VZ Vibration Z-Axis VZA[*] VZAD[*] VZE VZX Vibration X-Axis(SIS) VZA[*] NA VZE VZY Vibration Y-Axis(SIS) VZA[*] NA VZE VZZ Vibration Z-Axis(SIS) VZA[*] NA VZE W Weight, Force WA[*] WAD[*] WE WZ Force(SIS) WZA[*] NA WZE WD Weight Differential WDA[*] WDAD[*] WE WF Weight Ratio WFA[*] WFAD[*] WE WK Weight Loss (Gain) WKA[*] WKAD[*] WE WQ Weight Total WQA[*] WQAD[*] WE WX Force X Axis WXA[*] WXAD[*] WXE WY Force Y Axis WAY[*] WYAD[*] WYE WZ Force Z Axis WZA[*] WZAD[*] WZE WZX Force X Axis(SIS) WZXA[*] NA WZE WZY Force Y Axis(SIS) WZYA[*] NA WZE WZZ Force Z Axis(SIS) WZZA[*] NA WZE X Unclassified XA[*] XAD[*] XE Y Event, State, Presence YA[*] NA YE YZ Event, State(SIS) YZA[*] NA YZE Z Position, Dimension ZA[*] ZAD[*] ZE ZZ Position(SIS) ZZA[*] NA ZZE ZX Position X Axis ZXA[*] ZXAD[*] ZXE ZY Position Y Axis ZYA[*] ZYAD[*] ZYE ZZ Position Z Axis ZZA[*] ZZAD[*] ZZE ZZX Position X Axis(SIS) ZZXA[*] NA ZZXE ZZY Position Y Axis(SIS) ZZYA[*] NA ZZYE ZZZ Position Z Axis(SIS) ZZZA[*] NA ZZZE ZD Position Difference ZDA[*] ZDAD[*] ZDE ZDX Position Difference X Axis ZDXA[*] ZDXAD[*] ZDXE
G
I
L
Gauge, Indicate Glass
Light
TG (5) TDG (5) NA NA NA NA NA NA NA NA VG NA VXG VYG VZG NA NA NA WG NA NA NA NA NA NA NA NA NA NA NA XG NA NA ZG NA ZXG ZYG NA NA NA NA ZDG ZDXG
TL TDL NA NA NA NA TZL NA NA UZL VL VZL VXL VYL VZL VZL VZL VZL WL NA WDL NA WQL NA WXL WYL WZL WZXL WZYL WZZL XL YL YZL ZL ZZL ZXL ZYL ZZL ZZXL ZZYL ZZZL ZDL ZDXL
TI TDI TFI TJI TKI NA TZI UI UJI UZI VI VZI VXI VYI VZI VZI VZI VZI WI NA WDI WFI WKI WQI WXI WAI WZI WZI WZI WZI XI YI YZI ZI ZZI ZXI ZYI ZZI ZZXI ZZYI ZZZI ZDI ZDXI
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N User’s Choice (4a)
O P Q R Orifice, Point Integrate, Record Restrict- (Test Total ion Conn.) NA TP NA TR NA NA NA TDR NA NA NA TFR NA NA NA TJR NA NA NA TKR NA NA NA NA NA TZP NA TZR NA NA NA UR NA NA NA UJR NA UZP NA UZR NA VP NA VR NA NA NA VZR NA VXP NA VXR NA VYP NA VYR NA VZP NA VZR NA VZP NA VZR NA VZP NA VZR NA VZP NA VZR NA NA NA WR NA NA NA XR NA NA NA WDR NA NA NA WFR NA NA NA WKR NA NA NA WQR NA NA NA WXR NA NA NA WAR NA NA NA WZR NA WZXP NA WZXR NA WZYP NA WZYR NA WZZP NA WZZR NA XP XQ XR NA NA NA YR NA NA NA YZR NA NA NA ZR NA NA NA ZZR NA NA NA ZXR NA NA NA ZYR NA NA NA ZZR NA ZZXP NA ZZXR NA ZZYP NA ZZYR NA ZZZP NA ZZZR NA NA NA ZDR NA NA NA ZDXR
W
X
Well, Probe
Unclassified
TW NA NA NA NA NA TZW NA NA UZW NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA XW NA NA NA NA NA NA NA NA NA NA NA NA
TX TDX TFX TJX TKX NA NA UX UJX NA VX NA VXX VYX VZX NA NA NA WX NA WDX WFX WKX WQX WXX WAX WZX NA NA NA XX YX YZX ZX NA ZXX ZYX ZZX NA NA NA ZDX ZDXX
--`,,```,,,,````-`-`,,`,,`,`,,`---
Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
- 105 -
ANSI/ISA-5.1-2009
Table A.3.1 — Allowable succeeding letter combinations for readout/passive functions (1) (4b) Note: Numbers in parentheses refer to explanatory notes in Clause A.16.3. First Letters (2) E A B Absolute Function Deviation User’s Primary Alarm Modifier Choice Alarm Measured/Initiating Variables Element A [*] (3) (4d) AD (4a) w/ and w/o Modifiers ZDY Position Difference Y Axis ZDYA[*] ZDYAD[*] ZDYE ZDZ Position Difference Z Axis ZDZA[*] ZDZAD[*] ZDZE
G
I
Gauge, Indicate Glass ZDYG ZDZG
ZDYI ZDZI
L Light ZDYL ZDZL
N User’s Choice (4a)
O P Q R Orifice, Point Integrate, Record Restrict- (Test Total ion Conn.) NA NA NA ZDYR NA NA NA ZDZR
W
X
Well, Probe
Unclassified
NA NA
ZDYX ZDZX
Not for Resale //^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
Copyright International Society of Automation Provided by IHS under license with ISA No reproduction or networking permitted without license from IHS
ANSI/ISA-5.1-2009
- 106 -
Table A.3.2 — Allowable succeeding letter combinations for output/active function letters (1) (4b2)
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in A.16.3. First Letters K B C User’s Control Indicate Record Control Control Measured/Initiating Variables Choice Control Control Valve Station IC (8) RC (8) CV (9) C (7) w/ and w/o Modifiers (4a) A Analysis AC AIC ARC NA AK AZ Analysis(SIS)) AZC AZIC AZRC NA NA B Burner, Combustion BC BIC BRC NA BK BZ Burner, Comb.(SIS) BZC BZIC BZRC NA NA C User’s Choice D User’s Choice E Voltage EC EIC ERC NA EK EZ Voltage(SIS) EZC EZIC EZRC NA NA F Flow, Flow Rate FC FIC FRC FCV FK FF Flow Ratio FFC FFIC FFRC NA FFK FQ Flow Total FQC FQIC FQRC FQCV FQK FS Flow Safety NA NA NA FSV NA FZ Flow(SIS) FZC FZIC FZRC NA NA G User’s Choice H Hand HC HIC HRC HCV NA HZ Hand(SIS) HZC HZIC HZRC NA NA I Current IC IIC IRC NA IK IZ Current(SIS) IZC IZIC IZRC NA NA J Power JC JIC JRC NA JK JQ Power Totalize JQC JQIC JQRC NA JQK JZ Power(SIS) JZC JZIC JZRC NA NA K Time, Schedule KC KIC KRC NA KK KQ Time Totalize KQC KQIC KQRC NA NA L Level LC LIC LRC LCV LK LZ Level(SIS) LZC LZIC LZRC NA NA M User’s Choice N User’s Choice O User’s Choice P Pressure PC PIC PRC PCV (11) PK PD Pressure Differential PDC PDIC PDRC PDCV PDK PF Pressure Ratio PFC PFIC PFRC NA PFK PJ Pressure Scan NA NA NA NA NA PK Pressure Rate of Change PKC PKIC PKRC NA PKK PS Pressure Safety NA NA NA PSV NA PZ Pressure(SIS) PZC PZIC PZRC NA NA Q Quantity QC QIC QRC NA QK QQ Quantity Totalize QQC QQIC QQRC NA QQK R Radiation RC RIC RRC NA RK RQ Radiation Totalize RQC RQIC RQRC NA RQK RZ Radiation(SIS) RZC RZIC RZRC NA NA S Speed, Frequency SC SIC SRC SCV SK
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N User’s Choice (4a)
S T U V X Y Z Function Indicating Recording Valve Compute, MultiUnclassActuator, Transmit Modifier Damper Transmit Transmit Convert function ified Drive S [*] (3) (4d) T IT RT Louver Relay AS[*] AT AIT ART AU AV AX AY AZ [*] = AZS[*] Function AST NA NA AZU AZV NA AZY AZZ BS[*] Modifier BT BIT BRT BU BV BX BY BZ BZS[*] BZT NA NA BZU BZV NA BZY BZZ None
Switch
ES[*] EZS[*] FS[*] FFS[*] FQS[*] NA FZS[*] HS HZS IS[*] IZS[*] JS[*] JQS[*] JZS[*] KS[*] KQS LS[*] LZS[*]
HighHigh HH High H Low L LowLow LL Middle M Open O Close C Run R Stop S
PS[*] PDS[*] UnclassPFS[*] ified PJS[*] X PKS[*] NA PZS[*] QS[*] QQS[*] RS[*] RQS[*] RZS[*] SS[*]
ET EZT FT FFT FQT NA FZT
EIT NA FIT FFIT FQIT NA NA
ERT NA FRT FFRT FQRT NA NA
EU EZU FU FFU FQU NA FZU
NA NA FV FFV FQV FSV (10) FZV
EX EZX FX FFX FQX NA NA
EY EZY FY FFY FQY NA FZY
EZ EZZ NA NA NA NA NA
NA NA IT IZT JT JQT JZT NA NA LT LZT
NA NA IIT NA JIT JQIT NA NA NA LIT NA
NA NA IRT NA JRT JQRT NA NA NA LRT NA
HU HZU IU IZU JU JQU JZU KU KQU LU LZU
HV HZV NA NA NA NA NA NA KQV LV LZV
HX NA IX IZX JX JQX JZX KX KQX LX LZX
HY HZY IY IZY JY JQY JZY KY KQY LY LZY
HZ HZZ IZ IZZ JZ JQZ JZZ KZ KZZ LZ LZZ
PT PDT NA PJT NA NA PZT QT QQT RT RQT RZT ST
PIT PDIT NA NA NA NA NA QIT QQIT RIT NA NA SIT
PRT PDRT NA NA NA NA NA NA NA RRT NA NA SRT
PU PDU PFU NA PKU NA PZU QU QQU RU RQU RZU SU
PV PDV PFV NA PKV PSV (9) PZV QV QQV RV RQV RZV SV
PX PDX PFX NA PKX NA PZX QX QQX RX RQX RZX SX
PY PDY PFY NA PKY NA PZY QY QQY RY RQY RZY SY
PZ PDZ PFZ NA PKZ NA PZZ QZ QQZ RZ RQZ RZZ SZ
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ANSI/ISA-5.1-2009
Table A.3.2 — Allowable succeeding letter combinations for output/active function letters (1) (4b2)
Not for Resale
Note: Numbers in parentheses refer to explanatory notes in A.16.3. First Letters B C User’s Control Indicate Record Measured/Initiating Variables Choice Control Control IC (8) RC (8) C (7) w/ and w/o Modifiers (4a) SZ Speed(SIS) SZC SZIC SZRC T Temperature TC TIC TRC TD Temperature Differential TDC TDIC TDRC TF Temperature Ratio TFC TFIC TFRC TJ Temperature Scan NA NA NA TK Temperature Rate of Change TKC TKIC TKRC TS Temperature Safety NA NA NA TZ Temperature(SIS) TZC TZIC TZRC U Multivariable UC UIC URC UJ Multivariable Scan NA NA NA UZ Multivariable(SIS) UZC UZIC UZRC V Vibr., Mach. Analysis VC VIC VRC VZ Vibration(SIS) VZC VZIC VZRC VX Vibration X-Axis VXC VXIC VXRC VY Vibration Y-Axis VYC VYIC VYRC VZ Vibration Z-Axis VZC VZIC VZRC VZX Vibration X-Axis(SIS) VZXC VZXIC VZXRC VZY Vibration Y-Axis(SIS) VZYC VZYIC VZYRC VZZ Vibration Z-Axis(SIS) VZZC VZZIC VZZRC W Weight, Force WC WIC WRC WZ Force(SIS) WZC WZIC WZRC WD Weight Differential WDC WDIC WDRC WF Weight Ratio WFC WFIC WFRC WK Weight Loss (Gain) WKC WKIC WKRC WQ Weight Total WQC WQIC WQRC WX Force X Axis WXC WXIC WXRC WY Force Y Axis WYC WYIC WYRC WZ Force Z Axis WZC WZIC WZRC
K Control Valve CV (9) SZCV TCV NA NA NA NA TSV NA NA NA NA NA NA NA NA NA NA NA NA WCV NA NA NA NA NA NA NA NA
Control Station NA TK TDK TFK NA TKK NA NA NA NA NA VK NA NA NA NA NA NA NA WK NA WDK WFK WKK WQK WXK WYK WZK
N User’s Choice (4a)
S T Function Indicating Recording Transmit Modifier Transmit Transmit S [*] (3) (4d) T IT RT SZS[*] SZT NA NA TS[*]] TT TIT TRT TDS[*] TDT TDIT TDRT TFS[*] NA NA NA TJS[*] TJT NA NA TKS[*] NA NA NA NA NA NA NA TZS[*] TZT NA NA US[*] NA NA NA NA NA NA NA UZS[*] NA NA NA VS[*] VT VIT VRT VZS[*] VZT NA NA VXS[*] VXT VXIT VXRT VYS[*] VYT VYIT VYRT VZS[*] VZT VZIT VZRT VZXS[*] VZXT NA NA VZYS[*] VZYT NA NA VZZS[*] VZZT NA NA WS[*] WT WIT WRT WZS[*] WZT NA NA WDS[*] WDT WDIT WDRT WFS[*] NA NA NA WKS[*] WKT WKIT WKRT WQS[*] NA NA NA WXS[*] WXT WXIT WXRT WYS[*] WYT WYIT WYRT WZS[*] WZT WZIT WZRT Switch
U V X Y Z Valve Compute, MultiUnclassActuator, Damper Convert function ified Drive Louver Relay SZU SZV SZX SZY SZZ TU TV TX TY TZ TDU TDV TDX TDY TDZ TFU TFV TFX TFY TFZ NA NA NA NA NA TKU TKV TKX TKY TKZ NA TSV (9) NA NA NA TZU TZZV TZX TZY TZZ UU UV UX UY UZ NA NA NA NA NA UZU UZV UZX UZY UZZ VU NA VX VY NA VZZU NA VZX VZY NA VXU NA VXX VXY NA VYU NA VYX VYY NA VZU NA VZX VZY NA VZXU NA VZXX VZXY NA VZYU NA VZYX VZYY NA VZZU NA VZZX VZZY NA WU WV WX WY WZ WZU WZV WZX WZY WZZ WDU WDV WDX WDY WDZ WFU WFV WFX WFY NA WKU WKV WKX WKY WKZ WQU WQV WQX WQY WQZ WXU WXV WXX WXY WXZ WYU WYV WYX WYY WYZ WZU WZV WZX WZY WZZ
WZX
Force X Axis(SIS)
WZXC
WZXIC
WZXRC
NA
NA
WZXS[*]
WZXT
NA
NA
WZXU
WZXV
WZXX
WZXY
WZXZ
WZY WZZ X Y YZ Z ZZ ZX
Force Y Axis(SIS) Force Z Axis(SIS) Unclassified Event, State, Presence Event, State(SIS) Position, Dimension Position(SIS) Position X Axis
WZYC WZZC XC YC YZC ZC ZZC ZXC
WZYIC WZZIC XIC YIC YZIC ZIC ZZIC ZXIC
WZYRC WZZRC XRC YRC YZRC ZRC ZZRC ZXRC
NA NA NA NA NA NA NA NA
NA NA XK YK NA ZK NA ZXK
WZYS[*] WZZS[*] XS[*] YS[*] YZS[*] ZS[*] ZZS[*] ZXS[*]
WZYT WZZT XT YT YZT ZT ZZT ZXT
NA NA XIT YIT NA ZIT NA ZXIT
NA NA XRT YRT NA ZRT NA ZXRT
WZYU WZZU XU YU YZU ZU ZZU ZXU
WZYV WZZV XV YV YZV ZV ZZV ZXV
WZYX WZZX XX YX YZX ZX ZZX ZXX
WZYY WZZY XY YY YZY ZY ZZY ZXY
WZYZ WZZZ XZ YZ YZZ ZZ ZZZ ZXZ
--`,,```,,,,````-`-`,,`,,`,`,,`---
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Table A.3.2 — Allowable succeeding letter combinations for output/active function letters (1) (4b2) Note: Numbers in parentheses refer to explanatory notes in A.16.3. First Letters B C User’s Control Indicate Record Measured/Initiating Variables Choice Control Control IC (8) RC (8) C (7) w/ and w/o Modifiers (4a) ZY Position Y Axis ZYC ZYIC ZYRC ZZ Position Z Axis ZZC ZZIC ZZRC ZZX Position X Axis(SIS) ZZXC ZZXIC ZZXRC ZZY Position Y Axis(SIS) ZZYC ZZYIC ZZYRC ZZZ Position Z Axis(SIS) ZZZC ZZZIC ZZZRC ZD Position Difference ZDC ZDIC ZDRC ZDX Position Diff. X Axis ZDXC ZDXIC ZDXRC ZDY Position Diff. Y Axis ZDYC ZDYIC ZDYRC ZDZ Position Diff. Z Axis ZDZC ZDZIC ZDZRC
K Control Valve CV (9) NA NA NA NA NA NA NA NA NA
Control Station ZYK NA NA NA NA ZDK ZDXK ZDYK ZDZK
N User’s Choice (4a)
S T Function Indicating Recording Transmit Modifier Transmit Transmit S [*] (3) (4d) T IT RT ZYS[*] ZYT ZYIT ZYRT ZZS[*] ZZT NA NA ZZXS[*] ZZXT NA NA ZZYS[*] ZZYT NA NA ZZZS[*] ZZZT NA NA ZDS[*] ZDT ZDIT ZDRT ZDXS[*] ZDXT ZDXIT ZDXRT ZDYS[*] ZDYT ZDYIT ZDYRT ZDZS[*] ZDZT ZDZIT ZDZRT Switch
Not for Resale --`,,```,,,,````-`-`,,`,,`,`,,`---
U V X Y Z Valve Compute, MultiUnclassActuator, Damper Convert function ified Drive Louver Relay ZYU ZYV ZYX ZYY ZYZ ZZU ZZV ZZX ZZY ZZZ ZZXU ZZXV ZZXX ZZXY ZZXZ ZZYU ZZYV ZZYX ZZYY ZZYZ ZZZU ZZZV ZZZX ZZZY ZZZZ ZDU ZDV ZDX ZDY ZDZ ZDXU ZDXV ZDXX ZDXY ZDXZ ZDYU ZDYV ZDYX ZDYY ZDYZ ZDZU ZDZV ZDZX ZDZY ZDZZ
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ANSI/ISA-5.1-2009
Table A.4 — Loop and Identification Tag Number suffixes (1) (2) Note: Numbers in parentheses refer to explanatory notes in Clause A.16.4. Loop Identification Number Suffixes(Bold-Italic)
Identification/Tag Number suffixes (Bold-Underlined) Case 1 — Different services (3)
First Loop Suffix
After loop numbers
After first letters
Two devices with loop suffix after None
Numbers
Letters
F*01 FV*01-2
Alpha
Numeric
F*01A
F*01-1
None
Numbers
Letters
FV*01A-1A FV*01A-1B FV*01A-2A FV*01A-2B FV*01B-1A FV*01B-1B FV*01B-2A FV*01B-2B FV*01-1-1A FV*01-1-1B FV*01-1-2A FV*01-1-2B FV*01-2-1A FV*01-2-1B FV*01-2-2A FV*01-2-2B
FV-A-*01-1A FV-A-*01-1B FV-A-*01-2A FV-A-*01-2B FV-B-*01-1A FV-B-*01-1B FV-B-*01-2A FV-B-*01-2B FV-1-*01-1A FV-1-*01-1B FV-1-*01-2A FV-1-*01-2B FV-2-*01-1A FV-2-*01-1B FV-2-*01-2A FV-2-*01-2B
FV*01-1A FV*01-1B FV*01-2A FV*01-2B
FV*01-1 None
Four devices with loop suffix after
FV*01A-1
FV-A-*01-1
FV*01A-2
FV-A-*01-2
FV*01B-1
FV-B-*01-1
FV*01B-2
FV-B-*01-2
FV*01-1-1
FV-1-*01-1
FV*01-1-2
FV-1-*01-2
FV*01-2-1
FV-2-*01-1
FV*01-2-2
FV-2-*01-2
F-A-*01
F-1-*01
Case 2 — Same service (3) Two devices with loop suffix after None
Numbers
Letters
None
FV*01-A --`,,```,,,,````-`-`,,`,,`,`,,`---
Numbers
Letters
FV*01A-A1 FV*01A-A2 FV*01A-B1 FV*01A-B2 FV*01B-A1 FV*01B-A2 FV*01B-B1 FV*01B-B2 FV*01-1-A1 FV*01-1-A2 FV*01-1-B1 FV*01-1-B2 FV*01-2-A1 FV*01-2-A2 FV*01-2-B1 FV*01-2-B2
FV-A-*01-A1 FV-A-*01-A2 FV-A-*01-B1 FV-A-*01-B2 FV-B-*01-A1 FV-B-*01-A2 FV-B-*01-B1 FV-B-*01-B2 FV-1-*01-A1 FV-1-*01-A2 FV-1-*01-B1 FV-1-*01-B2 FV-2-*01-A1 FV-2-*01-A2 FV-2-*01-B1 FV-2-*01-B2
FV*01-A1 FV*01-B1 FV*01-A2 FV*01-B2
None FV*01-B FV*01A-A
FV-A-*01-A
FV*01A-B
FV-A-*01-B
FV*01B-A
FV-B-*01-A
FV*01B-B
FV-B-*01-B
FV*01-1-A
FV-1-*01-A
FV*01-1-B
FV-1-*01-B
FV*01-2-A
FV-2-*01-A
FV*01-2-B
FV-2-*01-B
Alpha
Numeric
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Four devices with loop suffix after
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Annex B
ANSI/ISA-5.1-2009
Graphic symbol guidelines (informative annex)
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B.1
Graphic symbols
B.1.1
This informative annex to the standard describes the use of graphic symbols that are used to depict instrument loop devices and functions, application software functions, and the interconnections between them that is logical, unique, and consistent in application with a minimum of exceptions, special uses, or requirements.
B.1.2
Graphic symbols, when used with identification letters and numbers constructed as described in Annex A, should as a minimum describe the functionality of, and if assigned a loop number provide a unique identity for, each device and function shown.
B.2
Instrument identification applied to graphic symbols
B.2.1
Instrument identification applied to graphic symbols should include, as a minimum, an alphabetic functional identification to identify the functionality of devices and functions shown in the diagrams as described in Annex A.
B.2.2
Tables A.3.1.1 through A.3.6.2 provide examples of allowable functional identifications.
B.2.3
Brief explanatory notes or other text may be added adjacent to a symbol or in the note section of a drawing or sketch to clarify the meaning or purpose of a device or function.
B.2.4
Loop Identification Number numerals, when assigned in accordance with A.6, complete the identity of the loop being shown.
B.2.5
Lettering fonts should be similar to Arial Narrow and be a minimum of 3/32in(1.125mm) high and a maximum of 13 characters per inch wide.
B.2.6
A Loop Number prefix should: a)
Not be used with bubbles on drawings but indicated in the note section.
b)
Be used with bubbles if more than one prefix is being used.
c)
Be used in text.
--`,,```,,,,````-`-`,,`,,`,`,,`---
B.3
Examples of graphic symbols with assigned instrument/tag numbers
B.3.1
Instrument bubble symbols should use the upper half of each symbol for Functional Identification Letters and the lower half of each symbol for Loop Numbers: a)
Five (5) characters or less: ABCDE 98765
b)
Six (6) characters or more, relieve sides of bubble or enlarge bubble as required:
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B.3.2
- 112 -
ABCDEFGHJKLM
ABCDEFGHJKLM
9876543210
9876543210
Functional diagramming, binary logic, and electrical schematic symbols should be tagged at either (A), (B), (C), or (D): (A) (A) (A)
(C)
∆
∆ (B)
P
I
D
A B C
K ∫ d/dt
(D) (C)
(D)
(A)
(A)
(B)
X
(B) A N O D (C) (D)
(A)
(B)
(B)
(B) (A) (B)
B.4
Graphic symbol applications
B.4.1
Graphic symbols provide representations of the instrumentation and functions required for process, machine, or equipment measurement, indication, control, modulation, and switching of variables by any or all of the following applications:
B.4.2
B.4.3
a)
Instrument diagrams
b)
Functional diagrams
c)
Binary logic diagrams
d)
Electrical schematics
The most common uses for: a)
Instrument diagrams are process flow diagrams (PFDs), piping and instrumentation diagrams (P&IDs), engineering flow diagrams (EFDs), and mechanical flow diagrams (MFDs).
b)
Functional diagrams are instrument loop device and function details and application software details for microprocessor-based control and monitoring systems.
c)
Binary logic diagrams are complex, interlocking, and stepwise logic programming and application software for microprocessor-based binary logic systems.
d)
Electrical schematics are electrical diagrams for motor and other on-off control.
All of the applications may be used to prepare sketches and drawings for books, magazines, journals, and instruction and maintenance manuals.
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ANSI/ISA-5.1-2009
B.5
Device and function symbols
B.5.1
Instrumentation devices and functions are constructed for sketches, drawings, and diagrams by the use of the generic bubble and other geometric symbols and specific graphic symbols found in Clause 5.
B.5.2
It is not necessary to show a symbol or a bubble for every device or function required by a loop if the need for the device or function or its tag number is clearly understood; for example:
B.5.3
a)
Symbols are not required, but may be used, for control valve positioners and stream sample conditioner components.
b)
Bubbles are not required, but may be used, for orifice plate, thermocouple, and control valve graphic symbols.
--`,,```,,,,````-`-`,,`,,`,`,,`---
When “smart” drawings, such as computer-generated P&IDs, that are linked to instrument indexes or data sheets are used, a bubble or graphic symbol to which an instrument tag number is attached should be used for all devices and functions that are to be indexed or require data sheets.
B.6
Instrument diagram and functional diagram example
B.6.1
Process Flow Diagrams (PFDs) are developed by process engineers to provide basic process data and to describe process operation. Simple instrument diagrams are used to indicate the primary process control measurements and controlled streams required to operate the process. Process monitoring and alarm points and secondary and auxiliary controls and monitors are not shown but are added during the detailed process design and P&ID development.
B.6.2
A simple flow control requirement should be shown on a PFD as: FC
a) B.6.3
Instrument tag numbers should not be assigned on PFDs.
A typical instrument diagram developed from the PFD diagram: I/P
FE *01
FIC
FY
*01
*01-A
FT
FY
*01
*01-B
FV *01
a)
Bubbles [FE-*01] and [FY-01-B] are optional and not recommended.
b)
Bubble [FV-*01] is optional but is recommended.
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ANSI/ISA-5.1-2009
B.6.4
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Typical equipment and function-oriented functional diagrams developed from the PFD diagram: FT
FT
*01
*01 ∆
∆
A
T
I
P
I
P
A
A
T
A
ƒ(x)
ƒ(x)
FV-*01
FV-*01 Equipment oriented
Function oriented
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
B.7
Process variable measurements
B.7.1
Process variable measurement devices are inserted in or mounted on pipelines and equipment to measure a physical property or to analyze a chemical composition, and include but are not limited to:
B.7.2
a)
Primary elements, such as orifice plates and thermocouples, that generate analog signals, position mechanical devices, or are used by transmitters to generate signals compatible with the control system.
b)
Transmitters with integral primary elements, such as vortex shedding flowmeters and filled-capillary temperature devices that generate signals compatible with the control system.
Process measurements are indicated by: a)
b) B.7.3
Bubbles as shown in Table 5.2.1 for: 1)
Generic primary elements.
2)
Primary elements that do not have a graphic symbol in Table 5.2.3.
3)
Users who elect not to use graphic symbols from Table 5.2.3.
Graphic symbols from Table 5.3.2.
Analyzer primary element located in a process slip stream or in a process stream or equipment with or without accessory devices, such as sample conditioners that contain components that are not normally shown, and with type of analyzer and component of interest noted at (**) and (***) respectively:
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a)
With sample conditioners: AE
TC
*01 C2 C3
AX *01
b)
VENT or DRAIN
(**)
*02 (***) AX *02
SMPL COND
(**)
AE
*01
TC
SMPL COND
VENT or DRAIN
VENT or DRAIN
*02 C2 C3
(***)
Analyzer primary element or transmitter inserted in process stream or equipment: AE
MOIST
AE
*03
B.7.4
AE
Without sample conditioners:
AE
c)
ANSI/ISA-5.1-2009
pH
*04
Orifice plate primary elements, with or without optional flow arrow, use generic orifice plate symbol with transmitter bubble connected to indicate orifice tap location for flange taps, corner taps, pipe taps, and vena contracta taps respectively: a)
Single process connection: corner taps, pipe taps, and vena contracta taps are indicated by notation: FT
FT
FT
FT
*01
*01
*01
*01
CT
b)
PT
FT
FT
FT
FT
*01
*02
*03
*03
PT
B.7.5
VC
Double process connection, pipe taps and vena contracta taps are indicated by notation:
Process root block valves should be shown as required by the piping engineering group.
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VC
ANSI/ISA-5.1-2009
B.7.6
- 116 -
Orifice meter tubes or runs that are specified and requisitioned by the instrument group should be shown on drawings and sketches by: a)
Bubble:
b)
Notation:
FX *01
NOTE 1
c)
NOTES 1. METER TUBE BY INSTRUMENTS.
Flanged or welded: METER TUBE
METER RUN
B.8
Final control elements
B.8.1
Final control elements installed in pipelines and equipment modulate or manipulate the process stream or equipment to affect the loop measured variable.
B.8.2
Final control elements include, but are not limited to, control valves, solenoid valves, louvers, dampers, motors, variable speed drives, and machine components.
B.8.3
Control valves are generally pneumatically operated and furnished with positioners that may:
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B.8.4
a)
Be actuated by a pneumatic or an electronic signal.
b)
Not be shown if all control valves are furnished with positioners.
Control valves with pneumatic or electronic signal: a)
I/P
Without positioner: FY *01 FV *01
FV *01
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b)
With positioner:
1)
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- 117 -
c)
With tripping solenoid, with and without positioner: S FV *01
B.8.5
ANSI/ISA-5.1-2009
LSL *11
S FV *01
LSL *11
Instrumentation with integral components that: a)
Measure process variables and transmit control and other functions as an integral part of a transmitter: FC *01
b)
FT
FC
*01
*01
Manipulates control valves as an integral part of a control valve positioner: FC *017
c)
Is an integral assembly that contains a transmitter, a controller, and a control valve: FC 101
--`,,```,,,,````-`-`,,`,,`,`,,`---
FT
FV
101
101
24VDC
24VDC
B.9
Common instrument-to-instrument signal connections
B.9.1
Pneumatic discrete instrumentation: FT
FRC
*01
*01
FV *01
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ANSI/ISA-5.1-2009
B.9.2
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Electronic discrete instrumentation: FT
FRC
*01
*01
FV *01
B.9.3
Shared display, shared control instrumentation: FT
FRC
*01
*01
FV *01
B.9.4
Shared display, shared control instrumentation, with diagnostic and calibration bus on field wiring: FT
FRC
*01
*01
FV *01
B.9.5
Shared display, shared control and wireless instrumentation: FT
FRC
*01
*01
FV *01
B.9.6
Shared display, shared control instrumentation, primary and alternate systems, no inter-bus communication: FT
FRC
*01
*01
FT
FRC
*11
*11
FV
DCS-1
*01
DCS-2
*01
FV
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B.9.7
ANSI/ISA-5.1-2009
Shared display, shared control, primary and alternate systems, with inter-bus communication: FI *11 FT
FC
*01
*01
DCS-2
FV DCS-1
*01
FI *11
B.9.8
FT
FC
*11
*11
DCS-1
FV DCS-2
*01
Shared display, shared control and fieldbus instrumentation, inter-bus communication: a)
Fieldbus transmitter/controller and electronic valve positioner: SP
FK
FI
*01
*01 FV *01
b)
Fieldbus valve positioner/controller and electronic transmitter: FI
FK
*01
*01
SP FC
FT
*01
*01
FV *01
c)
Fieldbus transmitter and valve positioner/controller: FI
FK
*01
*01
SP FC *01
FT *01
FV *01
--`,,```,,,,````-`-`,,`,,`,`,,`---
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FC *01
ANSI/ISA-5.1-2009
B.9.9
- 120 -
Fieldbus valve positioner/controller, transmitter, and indicator: FI *01 FC *01
FT *01
FV *01
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
B.9.10 Fieldbus integral transmitter, controller, and valve positioner: FI
FK
101
101
FC 101
24VDC
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B.9.11 Instrument and functional diagrams should not be used to specifically identify signal tubing, wiring, and bus construction methods used to implement a monitoring and control system.
B.10
Function block symbols
B.10.1 Signal processing functions should be identified by a function block symbol from Table 7.6 that is: a)
Appended to a bubble if an Instrument/Tag Number is required: Σ FY *012
b)
Attached tangentially to the affected bubble and in line with the signal if the function is an integral part of the affected bubble: Σ
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FI *012
Not for Resale
- 121 -
ANSI/ISA-5.1-2009
B.10.2 An example of a common application is the calculation of mass flow with an orifice plate primary element: Separate devices or functions that require separate bubbles and tag numbers: PT
TT
FT
*01
*01
*01
÷
b)
X
√⎯
FY
FY
FY
FI
*01-A
*01-B
*01-C
*01
Separate devices or application software functions that do not require separate bubbles or tag numbers for each function: TT *01 PT
÷
*01
X √⎯
FI *01
FT *01
c)
Integral devices or application software functions that do not require separate bubbles or tag numbers for each function: TT *01
B.11
PT
FI
FT
*01
*01
*01
MASS FLOW
Alarm indicators
B.11.1 Shared control and monitor functions generally allow the indication of four configurable alarms for process variables and setpoint deviations. B.11.2 Only alarms that are to be configured are shown. B.11.3 Instrument diagramming: a)
Process variable alarms: FT
FC
*01
*01
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HH H L LL
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--`,,```,,,,````-`-`,,`,,`,`,,`---
a)
ANSI/ISA-5.1-2009
b)
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
c)
- 122 -
Process variable deviation from setpoint alarms: FT
FC
*01
*01
DH DL
Process variable deviation from setpoint and process variable alarms: FT
FC
*01
*01
DH H L DL
B.11.4 Functional diagramming: a)
Process variable alarms: FT *01 HH/H/L/LL ∆ I
P A --`,,```,,,,````-`-`,,`,,`,`,,`---
b)
T
A
Process variable deviation from setpoint alarms: H/L
∆ I
P A
c)
T
A
Process variable deviation from setpoint and process variable alarms: H/L H/L
∆ I
P A
B.12
T
A
Multipoint, multivariable and multifunction instruments
B.12.1 Multipoint instruments are single or multivariable indicators or recorders that receive input signals from two (2) or more primary elements or transmitters. B.12.2 Multivariable instruments are controllers that receive input signals from two (2) or more primary elements or transmitters and control one (1) manipulated variable.
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- 123 -
ANSI/ISA-5.1-2009
B.12.3 Multifunction instruments are controllers that receive input signals from two (2) or more primary elements or transmitters and control two (2) or more manipulated variables. B.12.4 Single variable or multivariable multipoint recorders for two (2) or three (3) points are drawn with bubbles either: a)
b)
Tangent to each other in the same order, left to right, as the pen or pointer assignments: FR
PR
TR
*10
*11
*08
FT
PT
TT
*10
*11
*08
Separate from each other with pen number indicated and a note defining the multipoint instrument: FR *10
PEN #1
PR
PEN 2
TR
*11
NOTE 1
PEN #3
NOTE 1. PEN IN RECORDER, FR*10/PR*11/TR*08.
*08 NOTE 1
NOTE 1
FT
PT
TT
*10
*11
*08
B.12.5 Multipoint indicators and recorders for four (4) or more points are drawn with bubbles separate from each other, with point number indicated by adding a suffix to the tag numbers: a)
Single variable: TI
TE *01-01
b)
*01-01
TE
TE
TI
TI
TE
TI *01-04
*01-02
*01-02
*01-03
*01-03
*01-04
PT
UJI
LT
UJI
TE
UJI
*01-04
*01-04
Multivariable: TE
*01-01
*01-02
*01-03
*01-02
*01-03
--`,,```,,,,````-`-`,,`,,`,`,,`---
*01-01
UJI
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ANSI/ISA-5.1-2009
- 124 -
B.12.6 A multivariable controller example drawn with bubbles for each measured variable input, the output to the final control element, and measured variable indicators: PI *11
PT *11
TI *51
LI 21
FI *71
TT *51 UC *01
UV *01
FT *71
FO
B.12.7 variable multifunction controller example drawn with bubbles for measured variable inputs, controller and indicator functions, and final control elements, for example: PT *11
TI *51
TT *51 UU *01
FT *71
LT *21
--`,,```,,,,````-`-`,,`,,`,`,,`---
LT *21
L1 21
SP
FC *71
FV *71
UV *01 FO
B.13
An example of instrument, functional, and electrical diagrams for a simple process
B.13.1 Process control description: a)
Process description: 1)
b)
Tank periodically fills with a liquid, in small and large volumes over long and short time periods.
Control description: 1)
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Control system design for: a)
Small volumes for long and short periods should allow tank to fill to a high level to automatically start the pump and then to stop the pump at a low level.
b)
Large volumes for long periods should allow the pump to run continuously and maintain a fixed level with a level to flow cascade control loop.
Not for Resale
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\
FO
- 125 -
2)
ANSI/ISA-5.1-2009
Pump control is selected by a three-position Hand-Off-Auto selector switch:
3)
a)
Method a) selector switch is in “HAND” position.
b)
Method b) selector switch is in “AUTO” position.
Pump should be stopped at any time: a)
Automatically if low level is exceeded.
b)
By operating the stop pushbutton.
c)
Switching the H-O-A selector to “OFF” position.
B.13.2 Instrument diagram:
STOP
T-1
LSL
HS
LIC
*02
*02-B
*02
LT
START
*02
HS
HS
LSH
*02-A
*01
*02
FIC
H-O-A
FT
FV
*01
*01
FO
--`,,```,,,,````-`-`,,`,,`,`,,`---
P-1
*01
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ANSI/ISA-5.1-2009
- 126 -
B.13.3 Functional diagram
LSH*02 FT
LT
*01
*02
A N D
H
Ro
A ∆
HS
HS A
T
A
A N D PUMP P-1
OR
*02-A
A
T
OL
A N D
START
I
P
H-O-A
*01
∆
T I
P
S
S ƒ(x)
Ro STOP
FV*01
HS
L LSL*02
A N D
NOT
*02-B
OL
A N D
B.13.4 Electrical schematic diagram: START
M1 H 0 A
STOP HS*02-B
M
HS*01
OL
LSL*02 M2
LSH*02
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--`,,```,,,,````-`-`,,`,,`,`,,`---
HS*02-A
//^:^^#^~^^"#@::"~^$:~@""#:$@^"*^~@~$"~~""^^:@^^:#^~~\\ --`,,```,,,,````-`-`,,`,,`,`,,`---
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Not for Resale
Developing and promulgating sound consensus standards, recommended practices, and technical reports is one of ISA’s primary goals. To achieve this goal the Standards and Practices Department relies on the technical expertise and efforts of volunteer committee members, chairmen and reviewers. ISA is an American National Standards Institute (ANSI) accredited organization. ISA administers United States Technical Advisory Groups (USTAGs) and provides secretariat support for International Electrotechnical Commission (IEC) and International Organization for Standardization (ISO) committees that develop process measurement and control standards. To obtain additional information on the Society’s standards program, please write:
ISA Attn: Standards Department 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709
ISBN: 978-1-936007-29-5
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