Siemens SIMATIC ET 200SP Manual page 37

PC mode
4.2 Parameters/address space
Channel output filter down/up
Specifies the down or up output filter of a channel.
To increase the interference immunity of your application, use down or up output filters with
values from 500 ms to 60 s.
Quick changes of the filter input values are converted into smoother signal changes at the
filter output. This means, for example, that extreme currents in the heating phase of infrared
sources are limited.
In addition, you can also use output filters to reduce shifts in the zero crossings of the power
supply that can occur in isolating transformers.
This increases the accuracy of the module.
When you have configured a startup delay, the output filter is held at the reset state during
this delay.
Once the startup delay has expired, the output filter starts its linear ramp directly at the value
that was held during the startup delay.
Note that the configured filter times always refer to the process value jumps from 0% to
100% or from 100% to 0%.
This means the settling time of the filter is shorter for smaller jumps.
①
②
③
Figure 4-2
Each channel has its own output filters. These output filters always work with maximum
resolution.
Output filters are also in effect when the module is to output substitute values, for example,
after CPU STOP or in case of a communication failure.
This means all transitions are still smooth and infrared sources for hot gluing spots do not fail
immediately, for example, but are shut down slowly to ensure that the surface of the gluing
spots does not tear due to sudden cooling.
If you do not want to use output filters, use the parameter setting "No filter".
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Power without output filter
Power with output filter (max. slope according to Output filters parameter)
Startup delay
Power trend or average switch-on duration in case of phase control phase-angle
proportional with and without output filter
DQ 4x24..230VAC/2A HF digital output module (6ES7132-6FD00-0CU0)
Manual, 02/2018, A5E42404845-AA