Siemens SIMATIC ET 200S Operating Instructions Manual page 108

1Count24V/100kHz
2.9 Evaluation of count and direction signal
Double Evaluation
Double evaluation means that the rising and falling edge of the A signal are evaluated.
Whether up or down count pulses are generated depends on the level of the B signal.
The diagram below illustrates the double evaluation of the signals.
Figure 2-47
Quadruple Evaluation
Quadruple evaluation means that the rising and falling edges of the A and B signals are
evaluated. Whether up or down count pulses are generated depends on the levels of the A
and B signals.
The diagram below illustrates the quadruple evaluation of the signals.
Figure 2-48
108
Double Evaluation
Quadruple Evaluation
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05