Siemens SIMATIC S7-300 FM 350-1 Manual page 122

Operating Modes, parameters and commands
7.3 Count modes
Setting the Counter with DI Set
The counter can be loaded with the load value by means of a rising pulse edge across
DI Set.
You can set the response of the FM 350-1 to a positive pulse edge across DI Set by means
of the tags ENSET_UP and ENSET_DN in the DB of the FC CNT_CTL1 and by
parameterization.
Table 7- 26
Parameters
ENSET_UP set
ENSET_DN set
ENSET_UP and
ENSET_DN set
Parameter assignment
"single setting of
counter"
Parameter assignment
"Multiple setting of
counter"
Note
It is imperative that you set one of the two tags ENSET_UP or/and ENSET_DN so that the
counter can be set via digital input DI Set.
122
Setting the Counter with DI Set
Behavior of the FM 350-1
The counter is only set in the case of up counting
The counter is only set in the case of down counting
The counter is set in the case of up and down counting
The counter is set only at the first rising edge at DI Set.
If the counter is to be set again, you must first set ENSET_UP or
ENSET_DN again. The counter is then set again with the next positive edge
at DI Set.
As long as ENSET_UP and/or ENSET_DN are set, the counter will be set
with each rising edge at DI-Set.
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01