Siemens SIMATIC S7-200 System Manual page 557

Table C-18 Special Memory Bytes SMB130 to SMB165 (continued)
SM Byte
SM137.4
SM137.5
SM137.6
SM137.7
SM138 to
SM141
SM142 to
SM145
SM146.0 to
SM146.4
SM146.5
SM146.7
SM147.0
SM147.1
SM147.2
SM147.3
SM147.4
SM147.5
SM147.6
SM147.7
SMB148 to
SMB151
SMB152 to
SMB155
SM156.0 to
SM156.4
SM156.5
SM156.6
SM156.7
SM157.0 to
SM157.2
SM157.3
SM157.4
SM157.5
SM157.6
SM157.7
S7-200 Programmable Controller System Manual
A5E00066097-02
HSC3 update direction: 1 = update direction
HSC3 update preset value: 1 = write new preset value to HSC3 preset
HSC3 update current value: 1 = write new current value to HSC3 current
HSC3 enable bit: 1 = enable
HSC3 new current value: SM138 is most significant byte and SM141 is
least significant byte
HSC3 new preset value: SM142 is most significant byte and SM145 is the
least significant byte
Reserved
HSC4 current counting direction status bit: 1 = counting up
HSC4 current value is greater than preset value status bit: 1 = greater than
Active level control bit for Reset:
0 = Reset is active high, 1 = Reset is active low
Reserved
Counting rate selection for quadrature counters:
0 = 4x counting rate, 1 = 1x counting rate
HSC4 direction control bit: 1 = count up
HSC4 update direction: 1 = update direction
HSC4 update preset value: 1 = write new preset value to HSC4 preset
HSC4 update current value: 1 = write new current value to HSC4 current
HSC4 enable bit: 1 = enable
HSC4 new current value: SM148 is most significant byte and SM151 is
least significant byte
HSC4 new preset value: SM152 is most significant byte and SM155 is least
significant byte
Reserved
HSC5 current counting direction status bit: 1 = counting up
HSC5 current value equals preset value status bit: 1 = equal
HSC5 current value is greater than preset value status bit: 1 = greater than
Reserved
HSC5 direction control bit: 1 = count up
HSC5 update direction: 1 = update direction
HSC5 update preset value: 1 = write new preset value to HSC5 preset
HSC5 update current value: 1 = write new current value to HSC5 current
HSC5 enable bit: 1 = enable
Special Memory (SM) Bits
Description
C-15