D300529 0115 - BL67 I/O modules
12-73
BL67-1CNT/ENC
The parameterization of the evaluation is done in parameter-byte 0, bits 2 and 3, parameter "Signal
evaluation", see
page 12-85.
Figure 12-38:
signal A
signal B
single evaluation
rising edge at A
single evaluation
falling edge at A
double evaluation
quadruple evaluation
Scan points with different evaluations
The set configuration deter
mines how the counter status is incremented or decremented according to
the rising and falling edges of signals A and B. The following evaluations are possible: The following
evaluations are possible:
Single evaluation:
– Only the rising edge of signal A is evaluated.
or
–
Only the falling edge of signal A is evaluated.
Double evaluation:
Both the rising and falling edge of signal A are evaluated.
Fourfold evaluation:
Both the rising and falling edge of signal A and B are evaluated.
Pulse and direction
Input A receives the counte
r signal and input B the direction signal.
A signal at input A can either increment or decremen
t the counter status depending on the state of
input B.
The count direction or respect
ively the direction signal is parameterized in byte 1, bit 0 of the process
input data (see Process input/status interface).
NOTE
Evaluation
options for the
counter module
The signals at A and B can be inverted.
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