Siemens SIMATIC S7-200 - Page 557

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