Siemens SIMATIC S7-1200 Function Manual page 180

Using PID_Temp
6.2 Configuring PID_Temp
Control zone with deactivated cooling or cooling factor.
Control zone with activated cooling and PID parameter switching.
Rule for tuning
Select whether PI or PID parameters are to be calculated in the "Controller structure" drop-
down list. You can specify the rules for tuning for heating and for tuning for cooling
separately.
● PID (temperature)
Calculates PID parameters during pretuning and fine tuning.
Pretuning is designed for temperature processes and results in a slower and rather
asymptotic control response with lower overshoot than with the "PID" option. Fine tuning
is identical to the "PID" option.
The control zone width is determined automatically during pretuning only if this option is
selected.
● PID
Calculates PID parameters during pretuning and fine tuning.
● PI
Calculates PI parameters during pretuning and fine tuning.
● User-defined
The drop-down list displays "User-defined" if you have configured different controller
structures for pretuning and fine tuning via a user program or the parameter view.
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Function Manual, 03/2017, A5E35300227-AC
PID control