Siemens SIMATIC S7-1200 Function Manual page 130

Using PID_3Step
5.2 PID_3Step V2
Procedure
To perform pretuning, follow these steps:
1. Double-click the "PID_3Step > Commissioning" entry in the project tree.
2. Select the entry "Pretuning" in the "Tuning mode" drop-down list in the working area
"Tuning".
3. Click the "Start" icon.
– An online connection will be established.
– Value recording is started.
– Pretuning is started.
– The "Status" field displays the current steps and any errors that may have occurred.
Result
If pretuning was performed without an error message, the PID parameters have been tuned.
PID_3Step switches to automatic mode and uses the tuned parameters. The tuned PID
parameters will be retained during power OFF and a restart of the CPU.
If pretuning is not possible, PID_3Step responds with the configured reaction to errors.
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The progress bar indicates the progress of the current step.
Note
Click the "Stop" icon when the progress bar has reached 100% and it is to be
assumed the controller tuning function is blocked. Check the configuration of the
technology object and, if necessary, restart controller tuning.
Function Manual, 03/2017, A5E35300227-AC
PID control