Siemens SIMATIC S7-200 System Manual page 131

S7-200 Instruction Set Chapter 6
Example: IEC Counter Instructions
Timing Diagram
I4.0
CU - - Up
I3.0
CD - -
Down
I2.0
R - -
Reset
I1.0
LD - - Load
4 4 4 4
VW0
3 3 3
CV - -
2 2
Current
1
Value
0 0
Q0.0
QU - - Up
Q0.1
QD - - Down
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