Siemens FM 450-1 - Page 66

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
Underflow
Comparison value
Overflow
The output remains deactivated and is not a󹪜ected by the comparison value, zero crossing,
over󹪞ow, and under󹪞ow events.
Active between compari‐
son value and over󹪞ow
Underflow
Comparison value
Overflow
The output is enabled when the counter is within the range between comparison value n and
over󹪞ow. The output is activated by setting the counter to a value between the comparison value
and over󹪞ow.
Active between compari‐
son value and over󹪞ow
Underflow
Comparison value
Overflow
The output is activated when the counter is within the range between comparison value and
under󹪞ow. The output is activated by setting the counter to a value between the comparison
value and under󹪞ow.
Active for "pulse duration"
when the comparison val‐
ue is reached in up direction
t
Underflow
Comparison value
Overflow
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 val‐
ue is reached in down di‐
rection
t
Underflow
Comparison value
Overflow
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 di‐
rection
t
t
Underflow
Comparison
value
Overflow Overflow
Underflow
Comparison
value
Up
Down
The output is activated when the comparison value is reached for the time the pulse lasts, irre‐
spective of the counting direction.
A shaded in area in the table signi󹪝es: The output is active.
t = pulse duration
Modes, settings, parameters and commands
8.8 Setting: Behavior of the digital outputs
Counter module FM 450-1
66 Equipment Manual, 03/2022, A5E03648739-AC