turck BL20 Series - Page 386

Technology Modules
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Behavior of the DI digital input
The digital input can be run with different sensors (positive switch or push-pull).
The input signal can be inverted (exception: in Latch and retrigger function).
The STS_DI status bit indicates the status of the digital input.
The following digital input functions are available for selection in count mode:
 Digital input
 Hardware release (HW gate)
 Latch retrigger function when edge positive
 Synchronization when edge positive
The following digital input functions are available for selection in measurement mode:
 Digital input
 Hardware release (HW gate)
Behavior of the digital outputs DO1/DO2
Count mode
The digital outputs can be activated depending on the counter status and reference values.
The module is provided with a ”real” digital output and a ”virtual” digital output that is only present
as a status bit in the check-back interface/process input.
Two reference values can be stored on the counter module and assigned to the digital outputs sep-
arately.
The following functions can be selected:
 Output (no switching via comparator)
 Set if counter value  reference value
 Set if counter value  reference value
 Pulse if counter value = reference value
Comparison results for comparator 1 are assigned to the physical output DO1.
Comparison results for comparator 2 are assigned to the virtual output DO2.
Permissible value range for the two reference values