Technology instructions
10.2 PID control
S7-1200 Programmable controller
642 System Manual, V4.2, 09/2016, A5E02486680-AK
Additionally, click the parameter button with the downward arrow to open a small window
that shows the project (offline) start value and the PLC (online) start value of each
parameter:
Commissioning the PID_Temp controller
Use the commissioning edit
or to configure the PID controller for autotuning at startup
and for autotuning during operation. To open the commissioning editor, click the icon
on either the instruction or the project navigator.
Table 10- 34 Sample commissioning screen (PID_Temp)
Measurement: To display the setpoint, the process value
(input value) and the output value in a real-time trend,
enter the sample time and click the "Start" button.
Tuning mode: To tune the PID_Temp loop, select either
"Pretuning" or "Finetuning" (manual) and click the "Start"
button. The PID controller runs through multiple phases
to calculate system response and update times. The
appropriate tuning parameters are calculated from these
values.
After the completion of the tuning process, you can store
the new parameters by clicking the "Upload PID parame-
ters" button in the "PID Parameters" section of the com-
missioning editor.
If an error occurs during tuning, the output value of the
PID goes to "0". The PID mode then is set to "inactive"
mode. The status indicates the error.
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