Operation Example With Reset And Start; Operation Example Of Modes 0, 1, Or 2 - Siemens SIMATIC S7-200 System Manual

Start (Active High)
Reset (Active High)
Counter
Current Value
Figure 9-11
Clock
Internal
Direction
Control
(1 = Up)
Counter
Current
Value
Figure 9-12
S7-200 Programmable Controller System Manual
A5E00066097-02
Counter
Disabled
1
0
1
0
+2,147,483,647
Current
value
0
frozen
-2,147,483,648
Counter value is somewhere in this range.

Operation Example with Reset and Start

Current value loaded to 0, preset loaded to 4, counting direction set to Up.
Counter enable bit set to enabled.
1
0
1
0
3
2
1
0

Operation Example of Modes 0, 1, or 2

Reset interrupt Reset interrupt
generated generated
Counter Counter Counter
Enabled Disabled Enabled
Current
value
frozen
PV=CV interrupt generated
Direction changed within interrupt routine
4
3
2
1
0
SIMATIC Instructions
-1
9-29