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Signal evaluation for encoders
The evaluation options can be set in the BL20 counter module configuration. The following settings
are possible: The following error states are possible:
1-port
2-port
4-port
Scan points with different evaluations
The set configuration determines 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:
Single evaluation:
Only the rising 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.
In count mode rotary sensors with single, double and fourfold evaluation can be selected.
In measurement mode only rotary sensors with single evaluation can be selected.
Pulse and direction
Count mode
Input A receives the counter signal and input B the direction signal.
A signal at input A can either increment or decrement the counter status depending on the state of
input B.
Measurement mode
In this mode input B can receive a signal for the rotational direction. The process input/check-back
interface returns the status rotation direction via STS_DN and STS_UP.
Fig. 270: Evaluation options for count mode (measurement mode only allows single evaluation)
NOTE
The signals at A and B can be inverted.
Signal A
Signal B
Single
evaluation
Double
evaluation
Fourfold
evaluation
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