The basics of counting, measurement and position detection
2.2 Basics of counting, measuring and position input (TM Count, TM PosInput, Compact CPU)
Counting, measurement and position detection
74 Function Manual, 12/2017, A5E32009889-AG
With quadruple evaluation, the rising and falling edges of signals A and B are evaluated.
The edge direction of one signal and the level of the other signal determines whether count
pulses are generated in an upward or downward direction.
The figure below shows an example for quadruple evaluation of 24 V and TTL count signals:
The figure below shows an example for quadruple evaluation of RS422 count signals:
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