Siemens SIMATIC ET 200S Operating Instructions Manual page 24

1Count24V
2.6 Count Modes
The internal gate is automatically closed in the event of an overflow/underflow at the count
limits. To restart counting, you have to open the gate again.
Figure 2-3
With an interrupting gate function, the 1Count24V remains at the underflow when the gate is
started.
Figure 2-4
24
Count Once Without Main Count Direction; Canceling Gate Function
Count Once with Up as the Main Count Direction
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07