Siemens SIMATIC S7-1200 Function Manual page 132

Using PID_3Step
5.2 PID_3Step V2
Procedure
To perform fine tuning, follow these steps:
1. Select the entry "Fine tuning" in the "Tuning mode" drop-down list.
2. Click the "Start" icon.
– An online connection will be established.
– Value recording is started.
– The process of fine tuning is started.
– The "Status" field displays the current steps and any errors that may have occurred.
Note
Click the "Stop" icon in the "Tuning mode" group 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.
Result
If no errors occurred during fine tuning, 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 errors occurred during fine tuning, PID_3Step responds with the configured response to
errors.
132
The progress bar indicates the progress of the current step.
Function Manual, 03/2017, A5E35300227-AC
PID control