Siemens SIMATIC ET 200AL System Manual page 418

Counting
4.2 Configuration method 4xCount
High counting limit
With this parameter you specify the high counting limit.
The following applies:
● Low counting limit < High counting limit ≤ 2147483647 (2
Low counting limit
With this parameter you specify the low counting limit.
The following applies:
● High counting limit > Low counting limit ≥ -2147483648 (-2
Behavior DQ
With the "Behavior DQ" you select the counter values at which the count output is set.
When the current count value fulfils the parameterized condition, the associated count output
is set.
This means the signal state "1" is set at the count output when:
● Count value between a comparison value and the high counting limit:
Comparison value ≤ Count value ≤ High counting limit
or
● Count value between a comparison value and the low counting limit:
Low counting limit ≤ Count value ≤ Comparison value.
Hardware interrupt DQ
With this parameter you specify whether or not a hardware interrupt is generated by the
event "Comparison event occurred for DQ".
Behavior at CPU/master STOP for DQ
With this parameter you set the reaction of the count output of a counter after a
CPU/master STOP.
Behavior DQ:
● Continue: Signal state of the count output continues to be controlled by comparison
conditions.
● Output substitute value: The count output outputs a configured substitute value.
Note
Count value at CPU/Master STOP
Independently of the selected reaction of the count output, the count value continues to
change during a CPU/Master STOP depending on the input edge, counting continues.
Substitute value DQ
With this parameter you set the substitute value of the digital output of a counter if the setting
"Output substitute value" has been selected at the parameter "Behavior at CPU/master
STOP for DQ".
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Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
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Manual, 09/2017, A5E38688112-AB