Technology Modules
D300717 1211 - BL20 I/O modules
10-26
If the output is set for Switching >= Reference value, the digital output will have the following behavior
(example for DO1 - DO2 will respond accordingly):
Reference value + hysteresis
Reference value RV1
Reference value - hysteresis
If the output is set for Switch on counter value = reference value, a pulse is generated at output DO1.
Signal evaluation options for rotary sensors
The evaluation options can be set in the BL20 counter module configuration. The following settings are
possible:
Single
Double
Fourfold
Figure 10-15:
Hysteresis with
output set to
Switch >=
Reference value
Figure 10-16:
Evaluation
options for count
mode
(measurement
mode only allows
single evaluation)
a
b
c
t
t
t
Behavior DO1; count value
RV1; hysteresis = 0
f
Behavior DO1; count value
RV; hysteresis > 0
f
Signal A
Signal B
Single
evaluation
Double
evaluation
Fourfold
evaluation
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