Siemens SIMATIC S7-1200 Function Manual page 110

Using PID_Compact
4.3 PID_Compact V1
Result
If pretuning was performed without an error message, the PID parameters have been tuned.
PID_Compact 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_Compact will change to "Inactive" mode.
See also
Parameters State and sRet.i_Mode V1 (Page 293)
Commissioning V1 (Page 108)
Fine tuning V1 (Page 111)
"Manual" mode V1 (Page 113)
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Function Manual, 03/2017, A5E35300227-AC
PID control