Siemens SIMATIC S7-200 System Manual page 404

S7-200 Programmable Controller System Manual
Figure 15-5 shows the loop's response
to the same setpoint change (12000 to
14000) after applying the values
determined by the auto-tune process
using the selection for a fast response.
Notice that for this process there is no
overshoot, but there is just a little bit of
ringing. If you wish to eliminate the
ringing at the expense of the speed of
response, you need to select a medium
or a slow response and re-run the
auto-tuning process.
Once you have a good starting point for
the tuning parameters for your loop, you
can use the control panel to tweak the
parameters. Then you can monitor the
loop's response to a setpoint change. In loop's response to a setpoint change In
this way you can fine tune your process
for an optimum response in your
application.
390
Figure 15-5 Response after Auto-Tune Process