Siemens Simatic S7-200 System Manual page 122

S7-200 Programmable Controller System Manual
Example: IEC Counter Instructions
6
110
Timing Diagram
I4.0
CU – Up
I3.0
CD – Down
I2.0
R – Reset
I1.0
LD – Load
VW0
3
CV –
2
Current Value
1
0
Q0.0
QU – Up
Q0.1
QD – Down
4 4 4
3 3
2
4
0