Siemens SIMATIC S7-1200 Function Manual page 268

Instructions
9.1 PID_Compact
The following table shows how Mode and State change during pretuning with errors.
Cycle no.
0
1
1
n
n
If ActivateRecoverMode = TRUE, the operating mode that is saved in the Mode parameter is
activated. At the start of pretuning or fine tuning, PID_Compact has saved the value of State
in the Mode in/out parameter. PID_Compact therefore switches to the operating mode from
which tuning was started.
If ActivateRecoverMode = FALSE, the system switches to "Inactive" operating mode.
See also
Output parameters of PID_Compact V2 (Page 253)
268
Mode State Action
4 4 Set Mode = 1
1 4 Set ModeActivate = TRUE
4 1 Value of State is saved in Mode parameter
Pretuning is started
4 1 Pretuning canceled
4 4 Manual mode is started
Function Manual, 03/2017, A5E35300227-AC
PID control