Siemens SIMATIC S7-300 FM 350-1 - Page 99

Operating Modes, parameters and commands
7.3 Count modes
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
99
Periodic Counting - Main Count Direction Up
In periodic counting mode with main count direction up, when the gate is opened, the
FM 350-1 counts up or down from the load value until the high count limit is exceeded.
If the high count limit is exceeded, the following occurs:
● The STS_OFLW bit in the feedback interface is set
● The counter is set to the load value, from which it resumes counting
The high count limit can be set. The load value has a starting count and can be changed.
The counting is continued until the gate is closed.
6HWXSSHU
FRXQWOLPLW
&RXQWHUOHYHO
676B2)/:
6HWFRXQW
UDQJH
/RZHUFRXQW
OLPLW 
/RDGYDOXH
*DWHVWDUW
*DWHVWRS
7LPH
Figure 7-7 Periodic Counting With Main Count Direction Up