Allen-Bradley SLC 500 Manual page 189

Tag Variable Table
PLC Function Tag
Name Name
Bit Access
V Variable Bit V
I Input Bit I
Q Output Bit Q
M Memory Bit M
SM Special Bit SM
T Timer Bit T
C Counter Bit C
Byte Access
VB Variable Byte VB
IB Input Byte IB
QB Output Byte QB
MB Memory Byte MB
SMB Special Byte SMB
Word Access
VW Variable VW
TW Timer T
CW Counter C
IW Input IW
QW Output QW
MW Memory MW
SMW Special Mem SMW
AIW Analog Input AIW
AQW Analog Output AQW
Double Word Access
VD Variable VD
VF Variable Float VF
ID Input ID
QD Output QD
MD Memory MD
SMD Special Memory SMD
HCD High-Speed Cnt HC
Adding :U to the tag name will change the variable to unsigned. Unsigned integers are shown as (nnnnn).
(1) Above address 29 only
220 • • • • Siemens
Addr Bit Write Range
Range Range
0 - 65535 0 - 7 Yes 0 - 1
0 - 1023 0 - 7 Yes 0 - 1
0 - 1023 0 - 7 Yes 0 - 1
0 - 1023 0 - 7 Yes 0 - 1
0 - 1023 0 - 7 (1) 0 - 1
0 - 1023 NA Yes 0 - 1
0 - 1023 NA Yes 0 - 1
0 - 65535 NA Yes -128 to 127 (0 to 255)
0 - 1023 NA Yes -128 to 127 (0 to 255)
0 - 1023 NA Yes -128 to 127 (0 to 255)
0 - 1023 NA Yes -128 to 127 (0 to 255)
0 - 1023 NA (1) -128 to 127 (0 to 255)
0 - 65534 NA Yes -32768 to 32767 (0 to 65535)
0 - 1022 NA Yes 0 to 32767 (0 to 32767)
0 - 1022 NA Yes -32768 to 32767 (0 to 32767)
0 - 1022 NA Yes -32768 to 32767 (0 to 65535)
0 - 1022 NA Yes -32768 to 32767 (0 to 65535)
0 - 1022 NA Yes -32768 to 32767 (0 to 65535)
0 - 1022 NA (1) -32768 to 32767 (0 to 65535)
0 - 1022 NA No -32768 to 32767 (0 to 65535)
0 - 1022 NA No -32768 to 32767 (0 to 65535)
0 - 65532 NA Yes -2147483648 to 2147483647
0 to 4294967295
0 - 65532 NA Yes -2147483648 to 2147483647
0 to 4294967295
0 - 1020 NA Yes -2147483648 to 2147483647
0 to 4294967295
0 - 1020 NA Yes -2147483648 to 2147483647
0 to 4294967295
0 - 1020 NA Yes -2147483648 to 2147483647
0 to 4294967295
0 - 1020 NA (1) -2147483648 to 2147483647
0 to 4294967295
0 - 1020 NA No -2147483648 to 2147483647
0 to 4294967295
Sample
V89.4
I0.7
Q3.5
M11.2
SM23.0
T8
C9
VB60, VB60:U
IB3, IB3:U
QB1, QB1:U
MB4, MB4:U
SMB36, SMB36:U
VW700, VW700:U
T50, T50:U
C30, C30:U
IW4, IW4:U
QW5, QW5:U
MW13, MW13:U
SMW41, SMW41:U
AIW28, AIW28:U
AQW10, AQW10:U
VD1000
VD1000:U
VF1000
VF1000:U
ID3
ID3:U
QD4
QD4:U
MD12
MD12:U
SMD6
SMD6:U
HC0
HC0:U
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