Program instructions
7.6 Counters
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
273
SM37.3 SM47.3 SM57.3 SM137.3
SM147.3 SM157.3 Counting direction control bit:
• 0 = Count down
• 1 =Count up
SM37.4 SM47.4 SM57.4 SM137.4
SM147.4 SM157.4 Write the counting direction to the
HSC:
• 0 = No update
• 1 =Update direction
SM37.5 SM47.5 SM57.5 SM137.5
SM147.5 SM157.5 Write the new preset value to the
HSC:
• 0 = No update
• 1 = Update preset
SM37.6 SM47.6 SM57.6 SM137.6
SM147.6 SM157.6 Write the new current value to the
HSC:
• 0 = No update
• 1 =Update current value
SM37.7 SM47.7 SM57.7 SM137.7
SM147.7 SM157.7 Enable the HSC:
• 0 = Disable the HSC
• 1 =Enable the HSC
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
CV (counter current value)
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