Siemens FM 450-1 - Setting: Pulse Duration

Boundary conditions
If you assign the behavior of the digital outputs, you must observe the following boundary
conditions.
If ... then...
... you want to assign parameters for the output to
be "active between the comparison value and the
over󹪞ow or under󹪞ow" ...
...you must ensure that the time between the
events is longer than the minimum operating time
of the outputs (operating time: 300°µs); otherwise
the control pulses at the outputs are lost.
If the counter status again reaches the comparison
value while the output is still active, no new pulse
will be initiated. A further pulse can only be initi‐
ated when the output is no longer active.
...you want to assign the parameters for the output
to be "active for the pulse duration in the up count‐
ing direction"...
... you must not enable a hardware interrupt when
"the comparison value 1 or 2 in the down direction
is reached".
...you want to assign the parameters for the output
to be "active for the pulse duration in the down
counting direction"...
...you must not enable a hardware interrupt when
"the comparison value 1 or 2 in the up direction is
reached".
Disabling the outputs
The outputs are disabled by the following events, irrespective of the parameter assignment:
• Module watchdog timeout (internal error)
• Removal of the enable bit (CTRL_DQ0 for Q0 and CTRL_DQ1 for Q1 in the DB, see section
"Assignment of the DB (Page 87)")
Default setting
The outputs are disabled in the default setting.
8.9 Setting: Pulse duration
Introduction
As a means of adaptation to the actors used in your process (contactors, control elements etc.)
you have the possibility of specifying a pulse duration during which the outputs are set when a
comparison value is reached. This section describes what you must take into account if you want
to de󹪝ne a pulse duration for the outputs.
The e󹪜ect of the pulse duration setting
Via the pulse duration you also specify for how long the output should be set at minimum. This
setting is only e󹪜ective if you preselect the behavior of the output accordingly. The pulse
duration is without e󹪜ect if the output is to be set between the comparison value and over󹪞ow or
under󹪞ow.
Modes, settings, parameters and commands
8.9 Setting: Pulse duration
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 67