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Encoder Signals and Their Evaluation
10.4 Pulse Evaluation
Introduction
Single Evaluation
10
Double Evaluation
10-6
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The counters of the FM 450-1 can count the edges of the signals. Normally,
the edge at A (A*) is evaluated (single evaluation). To achieve a higher reso-
lution, you can decide via parameterization whether the signals are to have
single, double or quadruple evaluation.
Multiple evaluation is only possible in the case of incremental 5 V encoders
with signals A and B displaced by 90 , or in the case of incremental 24 V
encoders with signals A* and B* displaced by 90 .
Single evaluation means that only one edge of A is evaluated; up count
pulses are captured on a rising edge of A and low level at B, and down count
pulses are captured on a falling edge of A and low level at B.
Figure 10-3 shows single evaluation of the signals.
Signal A (A*)
Signal B (B*)
Up count
pulses
Down count
pulses
Up
Figure 10-3 Single Evaluation
Double evaluation means that the rising and falling edge of signal A are eva-
luated; whether up or down count pulses are generated depends on the level
of signal B.
Figure 10-4 shows double evaluation of the signals.
Signal A (A*)
Signal B (B*)
Up count
pulses
Down count
pulses
Up
Figure 10-4 Double Evaluation
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