Siemens Simatic S7-200 System Manual page 213

Phase A
1
Clock
0
1
Phase B
Clock
0
Counter
Current
Value
0
Figure 10-13
Phase A
Clock
Phase B
Clock
Counter Current
Value
0
Figure 10-14
S7-200 Programmable Controller System Manual
C79000-G7076-C230-02
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 HSC1 or HSC2 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
11
10
9
8
7
6
5
4
3
2
1
Operation Example of HSC1 or HSC2 Modes 9, 10, or 11 (Quadrature 4x Mode)
PV=CV interrupt generated and
Direction Changed interrupt
generated
4
3
2
PV=CV
Direction Changed
interrupt generated
interrupt generated
12
11
10
9
8
7
Instruction Set
6
10-25