Siemens S7-400 Service Manual Page 73

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Counter Instructions
Ladder Logic (LAD) for S7-300 and S7-400 Programming
A5E00706949-01
4-13
Example
I 0.1
Network 4
Network 3
Network 1
Network 2
C10
CU
C10
Q 4.0
I 0.0
Z10
SC
C#100
I 0.2
C10
R
"0" count value
detector
If the signal state of input I0.0 changes from "0" to "1" (positive edge in RLO), the
preset value of 100 is loaded to counter C10.
If the signal state of input I0.1 changes from "0" to "1" (positive edge in RLO),
counter C10 count value will be decremented by one unless the value of C10 is
equal to "0". If there is no positive edge in RLO, the value of C10 will be
unchanged.
If the count value = 0, then Q4.0 is turned on.
If the signal state of input I0.2 is "1", the counter C10 is reset to "0".
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