Siemens SIMATIC ET 200AL - 2 xCount Counting Limit Behavior; Edge Selection and Limit Behavior Explanations

Counting
4.1 Configuration method 2xCount
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
40 Manual, 03/2019, A5E38688112-AC
Edge selection
Use this parameter to select the edge that is counted:
● At rising edge:
The respective counter counts all the rising edges at the counter input.
● At falling edge:
The respective counter counts all the falling edges at the counter input.
Note
If you have p
arameterized DI
5
or DI
7
as the direction input in the respective counter and the
counting direction changes in the process, the count edge is adapted automatically (contrary
edges).
Behavior when a counting limit is exceeded
With this parameter you select the behavior when the high counting limit is violated in the
upward direction or the low counting limit is violated in the downward direction:
● Stop counting:
After a counting limit is violated, the internal gate is closed. This stops the counting
process. The counter value is set to the opposite counting limit. To start the counting
process again, you must close and reopen the SW gate.
● Continue counting:
After a counting limit is violated, the counter value is set to the opposite counting limit and
counting continues.
Comparison value
With this parameter you specify the comparison value.
The following applies:
● Low counting limit ≤ Comparison value ≤ High counting limit
Start value
With this parameter you specify the start value.
The following applies:
● Low counting limit ≤ Start value ≤ High counting limit
High counting limit
With this parameter you specify the high counting limit.
The following applies:
● Low counting limit < High counting limit ≤ 2147483647 (2
31
- 1)
Low counting limit
With this parameter you specify the low counting limit.
The following applies:
● High counting limit > Low counting limit ≥ -2147483648 (-2
31
)