Siemens SIMATIC S7-1200 - 10.2.7 Commissioning the PID_Compact and PID_3 Step controllers

Technology instructions
10.2 PID control
S7-1200 Programmable controller
640 System Manual, V4.2, 09/2016, A5E02486680-AK
10.2.7
Commissioning the PID_Compact and PID_3Step controllers
Use the commissioning editor 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- 33 Sample commissioning screen (PID_3Step)
• Measurement: To display the setpoint, the pro-
cess value (input value) and the output value in a re-
al-time trend, enter the sample time and click the
"Start" button.
• Tuning mode: To tune the PID loop, select either
"Pre-tuning" or "Fine tuning" (manual) and click the
"Start" button. The PID controller runs through multi-
ple phases to calculate system response and update
times. The appropriate tuning parameters are calcu-
lated from these values.
After the completion of the tuning process, you can
store the new parameters by clicking the "Upload PID
parameters" button in the "PID Parameters" section of
the commissioning 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.