Siemens SIMATIC S7-1200 - Page 333

Instructions
9.2 PID_3Step
PID control
Function Manual, 03/2017, A5E35300227-AC
333
ENO characteristics
If State = 0, then ENO = FALSE.
If State ≠ 0, then ENO = TRUE.
Automatic switchover of operating mode during commissioning
Automatic mode is activated following successful pretuning or fine tuning. The following table
shows how Mode and State change during successful pretuning.
Cycle no.
Mode
State
Action
0
4
4
Set Mode = 1
1 1 4 Set ModeActivate = TRUE
1 4 1 Value of State is saved in Mode parameter
Pretuning is started
n 4 1 Pretuning successfully completed
n
3
3
Automatic mode is started
PID_3Step automatically switches the operating mode in the event of an error. The following
table shows how Mode and State change during pretuning with errors.
Cycle no.
Mode
State
Action
0
4
4
Set Mode = 1
1
1
4
Set ModeActivate = TRUE
1 4 1 Value of State is saved in Mode parameter
Pretuning is started
n
4
1
Pretuning canceled
n
4
4
Manual mode is started
If ActivateRecoverMode = TRUE, the operating mode that is saved in the Mode parameter is
activated. At the start of transition time measurement, pretuning, or fine tuning, PID_3Step
saved the value of State in the Mode in/out parameter. PID_3Step therefore switches to the
operating mode from which transition time measurement or tuning was started.
If ActivateRecoverMode = FALSE, "Inactive" or "Approach substitute output value" mode is
activated.
Automatic switchover of operating mode after transition time measurement
If ActivateRecoverMode = TRUE, the operating mode that is saved in the Mode parameter is
activated after successful transition time measurement.
If ActivateRecoverMode = FALSE, the system switches to "Inactive" operating mode after
successful transition time measurement.