Siemens SIMATIC S7-300 FM 350-1 Manual page 106

Operating Modes, parameters and commands
7.3 Count modes
SW gate status
The status of the SW gate is indicated at the STS_SW_G bit in the DB of FC CNT_CTL1.
Cancel and interrupt function of the gate
In your gate function parameters, you can define whether the gate should cancel or interrupt
the count.
When the canceling gate function is active, the count stop when the gate closes, and is
restarted at the load value when the gate is retriggered (time
Figure 7-13
When the interrupting gate function is active, the count stops when the gate closes, and
resumes at the last actual count value when the gate is retriggered (time
below):
Figure 7-14
106
Continuous down count, canceling gate function
Continuous up count, interrupting gate function
①
in the figure below):
①
in the figure
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01