Siemens simatic s7-400 FM 450-1, User Manual, Page: 86 / 130

Modes, settings, parameters and commands
8.12 Initiating a process interrupt
Counter module FM 450-1
86
Manual, 02/2014, A5E03648739-02
Setting counter once with input 1I2 (2I2)
The following figure shows counter 1 being set once with input 1I2. The situation is
analogous for counter 2 with input 2I2. In the case represented here, only ENSET_UP is set,
i.e., the counter is set during up counting.
The relevant counter is set with the first rising edge at input 1I2, as long as ENSET_UP is
set. If you want to set this counter again, first you must reset the relevant ENSET_UP and
then set it again. Then the next positive edge at input 1I2 results in the counter being set.
Figure 8-7 Single setting of counter 1 with input 1I2