Evaluation Of Count And Direction Signal - Siemens SIMATIC ET 200S Operating Instructions Manual

1Count5V/500kHz

3.9 Evaluation of count and direction signal

3.9 Evaluation of count and direction signal
Signal Evaluation A, B
Signal evaluation by means of A, B allows you to count directionally. Different evaluation
modes are possible depending on the parameter assignment:
Rotary encoder
The 1Count5V/500kHz can count the edges of the signals. Normally, only the edges at A are
evaluated (single evaluation). To obtain a higher resolution, when assigning parameters
('Signal Evaluation' parameter), you can select whether the signals are to be subjected to
single, double, or quadruple evaluation.
Multiple evaluation is only possible with asymmetric incremental encoders with A and B
signals that are 90 degrees out of phase.
Single Evaluation
Single evaluation means that only one edge of A is evaluated; up count pulses are recorded
at a positive edge at A and low level at B, and down count pulses are recorded at a negative
edge at A and low level at B.
The diagram below illustrates the single evaluation of the signals.
Figure 3-45
212
Single Evaluation
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05