Program instructions
7.6 Counters
S7-200 SMART
230 System Manual, 09/2015, A5E03822230-AC
When you use counting modes 6 or 7, and rising edges on both the up clock and down clock
inputs occur within 0.3 microseconds of each other, the high-speed counter could see these
events as happening simultaneously. If this happens, the current value is unchanged and no
change in counting direction is indicated. As long as the separation between rising edges of
the up and down clock inputs is greater than this time period, the high-speed counter
captures each event separately. In either case, no error is generated and the counter
maintains the correct count value.
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