Siemens SIMATIC S7-300 FM 350-1 - Single Counting

Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
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7.3.4 Single counting
Overview
In this operating mode the FM 350-1 counts once in the assigned main count direction and
then stops the counting process automatically. You can assign the following behavior:
● Single counting – No main count direction
● Single counting - Main count direction up
● Single counting - Main count direction down
Single counting – No main count direction
In single counting mode with no main count direction, when the gate is opened, the
FM 350-1 counts up or down from the load value until one of the count limits is exceeded.
When one of the count limits is exceeded, the following occurs:
● The gate is closed
● The STS_OFLW or STS_UFLW bit in the feedback interface is set
● The counter is loaded to the other count limit
The count limits are fixed at the maximum count range.
The STS_ZERO bit is set if the counter level is zero.
You must open the gate again to restart the counting.
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Figure 7-2 Single counting without main count direction; canceling gate function