Specifications

SIMATIC Instructions
9-29
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Start (Active High) 0
1
Reset (Active High)
-2,147,483,648
0
+2,147,483,647
Reset interrupt
generated
1
0
Counter
Enabled
Counter
Disabled
Counter
Current Value
Counter
Disabled
Reset interrupt
generated
Counter
Enabled
Current
value
frozen
Counter value is somewhere in this range.
Current
value
frozen
Figure 9-11 Operation Example with Reset and Start
Clock 0
1
Internal
Direction
Control
(1 = Up)
0
1
0
Current value loaded to 0, preset loaded to 4, counting direction set to Up.
Counter enable bit set to enabled.
Counter
Current
Value
PV=CV interrupt generated
Direction changed within interrupt routine
1
2
3
4
3
2
1
0
-1
Figure 9-12 Operation Example of Modes 0, 1, or 2