The basics of counting, measurement and position detection
2.2 Basics of counting, measuring and position input (TM Count, TM PosInput, Compact CPU)
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
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Behavior at the counting limits
Violation of a counting limit
The high counting limit is violated when the current counter value is equal to the high
counting limit and another upward count pulse is received. The counter low limit is violated
when the current counter value is equal to the counter low limit and another downward count
pulse is received.
The appropriate status bit is set in the feedback interface in the event of limit violation:
Low counting limit EVENT_UFLW is set
You can reset the status bits with RES_EVENT .
You can configure whether or not and from which counter value counting is to continue
following counting limit violation.
Note
The high counting limit and the start value define the value range of the counter:
Value range of the counter = (high limit
– start value) + 1
The figure below shows an example for terminating the counting process (automatic gate
stop) after an overflow and setting the counter to the start value:
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