Siemens SIMATIC S7 System Manual page 273

HSC Control bytes
HSC0
SM37.3
SM37.4
SM37.5
SM37.6
SM37.7
Read the HSC current value with your program
You can only read the current value of each high-speed counter using the data type HC
(High-Speed-Counter Current) followed by the counter identifier number (0, 1, 2, 3, 4, or 5)
as shown in the following table. Use the HC data type whenever you wish to read the current
count, either in a status chart or in the user program. The HC data type is read-only double
word value; you cannot write a new current count to the high-speed counter using the HC
data type.
Current values of HSC0, HSC1, HSC2, HSC3, HSC4, and HSC5
Value to be read
CV (counter current value) HC0
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
HSC1 HSC2 HSC3
SM47.3 SM57.3 SM137.3 SM147.3 SM157.3 Counting direction control bit:
SM47.4 SM57.4 SM137.4 SM147.4 SM157.4 Write the counting direction to the
SM47.5 SM57.5 SM137.5 SM147.5 SM157.5 Write the new preset value to the
SM47.6 SM57.6 SM137.6 SM147.6 SM157.6 Write the new current value to the
SM47.7 SM57.7 SM137.7 SM147.7 SM157.7 Enable the HSC:
HSC0
address
HSC4 HSC5 Description
•
•
HSC:
•
•
HSC:
•
•
HSC:
•
•
•
•
HSC1 HSC2 HSC3
address address address
HC1 HC2 HC3
Program instructions
7.6 Counters
0 = Count down
1 =Count up
0 = No update
1 =Update direction
0 = No update
1 = Update preset
0 = No update
1 =Update current value
0 = Disable the HSC
1 =Enable the HSC
HSC4 HSC5
address address
HC4 HC5
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