Siemens simatic s7-400 FM 450-1, User Manual, Page: 77 / 130

Modes, settings, parameters and commands
8.12 Initiating a process interrupt
Counter module FM 450-1
Manual, 02/2014, A5E03648739-02
77
Behavior of the outputs
For the two outputs you can set one of six possible responses to reaching the comparison
value. The various options are shown in the following table.
Digital output parameter
assignment
Behavior of the outputs
Disable
The output remains deactivated and is not affected by the comparison value, zero crossing,
overflow, and underflow events.
Active between
comparison value and
overflow
The output is enabled when the counter is within the range between comparison value n and
overflow. The output is activated by setting the counter to a value between the comparison
value and overflow.
Active between
comparison value and
overflow
The output is activated when the counter is within the range between comparison value and
underflow. The output is activated by setting the counter to a value between the comparison
value and underflow.
Active for "pulse duration"
when the comparison
value is reached in up
direction
The output is activated when the comparison value is reached in the up counting direction for
the time the pulse lasts.
Active for "pulse duration"
when the comparison
value is reached in down
direction
The output is activated when the comparison value is reached in the down count direction for
the time the pulse lasts.
Active for "pulse duration"
when comparison value is
reached in up or down
direction
The output is activated when the comparison value is reached for the time the pulse lasts,
irrespective of the counting direction.
A shaded in area in the table signifies: The output is active.
t = pulse duration