Setting: Pulse Duration - Siemens SIMATIC FM 450-1 Manual

9.8

Setting: Pulse Duration

Introduction
To adapt to the actuators used in your process (contactors, final control ele-
ments, etc.), you can specify the pulse duration during which the outputs are
set when a comparison value is reached. This section describes what you
must observe if you want to define a pulse duration for the outputs.
Using the Pulse The pulse duration defines the minimum time the output must be set. This
Duration setting only takes effect if you preselect the behavior of the output accord-
ingly. The pulse duration is not effective if the output is to be set between the
comparison value and the overflow or underflow.
The pulse duration begins when the output is set. The inaccuracy of the pulse
duration is less than 1 ms.
Value Range
You can specify a value between 0 and 500 ms for the pulse duration. This
value applies for both outputs.
Note
If you specify zero as the pulse duration, you must ensure that the count
pulse times are greater than the minimum switching times of the digital out-
puts (switching time: 300 s, that is, count frequency less than 3333 Hz);
otherwise the control pulses at the outputs will be lost.
Check whether your actuator can respond with the switching time of 300 s to
cover this eventuality.
Default Value The default value for the pulse duration is 0.
FM 450-1 Counter Function Module
C79000-G7076-C450-01
www.gkbpx.com
Operating Modes, Settings, Parameters and Commands
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