Siemens SIMATIC S7-200 - Operation Example of Modes 9, 10, or 11 (Quadrature 1 X Mode); Operation Example of Modes 9, 10, or 11 (Quadrature 4 X Mode)

SIMATIC Instructions
9-31
S7-200 Programmable Controller System Manual
A5E00066097-02
Phase A
Clock
0
1
Phase B
Clock
0
1
0
Current value loaded to 0, preset loaded to 3, initial counting direction set to Up.
Counter enable bit set to enabled.
Counter
Current
Value
PV=CV interrupt
generated
1
2
3
4
3
PV=CV interrupt generated and
Direction Changed interrupt
generated
2
Figure 9-15 Operation Example of Modes 9, 10, or 11 (Quadrature 1x Mode)
Phase A
Clock
0
1
Phase B
Clock
0
1
0
Current value loaded to 0, preset loaded to 9, initial counting direction set
to Up. Counter enable bit set to enabled.
Counter Current
Value
PV=CV interrupt generated
1
2
3
4
5
PV=CV
interrupt generated
6
7
8
9
10
12
Direction Changed
interrupt generated
11
6
7
8
9
10
11
Figure 9-16 Operation Example of Modes 9, 10, or 11 (Quadrature 4x Mode)