Siemens SIMATIC S7-1200 - Page 577

Technology instructions
10.1 Counting (High-speed counters)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
577
A/B counter fourfold
A/B phase quadrature fourfold counts:
● Up on the rising edge of the clock A input when the clock B input is low
● Up on the falling edge of the clock A input when the clock B input is high
● Up on the rising edge of the clock B input when the clock A input is high
● Up on the falling edge of the clock B input when the clock A input is low
● Down on the rising edge of the clock B input when the clock A input is low
● Down on the falling edge of the clock B input when the clock A input is high
● Down on the rising edge of the clock A input when the clock B input is high
● Down on the falling edge of the clock A input when the clock B input is low