Siemens SIMATIC S7-1200

Technology instructions
10.1 Counting (High-speed counters)
S7-1200 Programmable controller
574 System Manual, V4.2, 09/2016, A5E02486680-AK
10.1.3.2
Operating phase
Select the desired operating phase of the HSC. The four figures below show when the
counter value changes, when the current value (CV) equals the reference value (RV) event
occurs, and when the direction change event occurs.
Single phase
Single-phase (not available with motion control) counts pulses:
● User program (internal direction control):
– 1 is up
– -1 is down
● Hardware input (external direction control):
– High level is up.
– Low level is down.