Technology instructions
10.1 Counting (High-speed counters)
S7-1200 Programmable controller
576 System Manual, V4.2, 09/2016, A5E02486680-AK
A/B phase quadrature counts:
● Up on the rising edge of the clock A input when the clock B input is low
● Down on the falling edge of the clock A input when the clock B input is low
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