Operation Example Of Modes 9, 10, Or 11 (Quadrature 1X Mode); Operation Example Of Modes 9, 10, Or 11 (Quadrature 4X Mode) - Siemens SIMATIC S7-200 System Manual

Phase A
1
Clock
0
Phase B 1
Clock
0
Counter
Current
Value
0
Figure 9-15
Phase A
Clock
Phase B
Clock
Counter Current
Value
Figure 9-16
S7-200 Programmable Controller System Manual
A5E00066097-02
Current value loaded to 0, preset loaded to 3, initial counting direction set to Up.
Counter enable bit set to enabled.
PV=CV interrupt
generated
3
2
1

Operation Example of Modes 9, 10, or 11 (Quadrature 1x Mode)

Current value loaded to 0, preset loaded to 9, initial counting direction set
to Up. Counter enable bit set to enabled.
PV=CV interrupt generated
1
0
1
0
10
9
8
7
6
5
4
3
2
1
0

Operation Example of Modes 9, 10, or 11 (Quadrature 4x Mode)

PV=CV interrupt generated and
Direction Changed interrupt
generated
4
3
Direction Changed
interrupt generated
12
11
11
SIMATIC Instructions
2
PV=CV
interrupt generated
10
9
8
7
6
9-31