Siemens simatic s7-400 FM 450-1, User Manual, Page: 71 / 130

Modes, settings, parameters and commands
8.12 Initiating a process interrupt
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02
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8.5 Single counting
Overview
In this mode an FM°450-1 counter counts once from the load value up to the count limit.
Select gate function
In this mode you can select the gate function Options:
● SW gate
● HW gate, level-controlled or edge-controlled
Figure 8-2 Single counting with load value and gate function
Open and close SW gate
You open and close the SW gate and set the counter to the load value with the input
parameter SW_GATE of the FC CNT_CTRL.
Action Initiating event
Open SW gate Set SW_GATE
Close SW gate Reset SW_GATE