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
72 Function Manual, 12/2017, A5E32009889-AG
Signal evaluation of incremental signals
2.2.14.1
The technology module counter counts the edges of encoder signals A and B. For
incremental encoders with phase-shifted signals A and B, you can select either single or
multiple evaluation to improve the resolution.
You can configure the following signal evaluations:
● Single evaluation (Page 72)
● Double evaluation (Page 73)
● Quadruple evaluation (Page 74)
Single evaluation evaluates the rising and falling edge at signal A when signal B has a low
level.
Count pulses in an upwards direction are generated with a rising edge at signal A during a
low level at signal B. Count pulses in a downwards direction are generated with a falling
edge at signal A during a low level of signal B.
The following figure shows an example for single evaluation of 24 V and TTL count signals:
The following figure shows an example for single evaluation of RS422 count signals:
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