Siemens FM 450-1 - Page 84

Signal A (A*)
Signal B (B*)
Up count
pulses
Down count
pulses
Up
Down
Figure 9-4 Single evaluation
Double evaluation
Double evaluation refers to the evaluation of the positive and negative edges of signal A. The
logic level at signal B determines the count direction, i.e. the up or down count pulse.
The diagram shows the double evaluation of signals:
6LJQDO$$
6LJQDO%%
8SFRXQW
SXOVHV
'RZQFRXQW
SXOVHV
'RZQ8S
Figure 9-5 Double evaluation
Quadruple evaluation
Quadruple evaluation refers to the evaluation of the positive and negative edges of signals A and
B. The logic level at the signals A and B determines the count direction, i.e. the up or down count
pulse.
The diagram shows quadruple evaluation of signals:
Signal A (A*)
Signal B (B*)
Up count
pulses
Down count
pulses
Up
Down
Figure 9-6 Quadruple evaluation
Encoder signals and their evaluation
9.5 Signal evaluation
Counter module FM 450-1
84 Equipment Manual, 03/2022, A5E03648739-AC