Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 98 / 198

Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
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Manual, 05/2011, A5E03648639-01
7.3.5 Cyclic count
Overview
In this operating mode, the FM 350-1 counts periodically when the gate is open. You can
assign the following behavior:
●
Periodic counting – No main count direction
● Periodic counting - Main count direction up
● Periodic counting - Main count direction down
Periodic counting – No main count direction
In periodic counting mode without a 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.
If one of the count limits is exceeded, the following occurs:
●
The STS_OFLW or STS_UFLW bit in the feedback interface is set
● The counter is set to the load value, from which it resumes counting
The count limits are fixed at the maximum count range
The STS_ZERO bit is set if the counter level is zero.
The counting is continued until the gate is closed.
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Figure 7-6 Periodic Counting Without Main Count Direction