Siemens SIMATIC S7-1200 Function Manual page 148

Using PID_3Step
5.3 PID_3Step V1
T
I
a
T
D
c
The diagram below illustrates the integration of the parameters into the PID algorithm:
All PID parameters are retentive. If you enter the PID parameters manually, you must
completely download PID_3Step.
Downloading technology objects to device (Page 44)
Proportional gain
The value specifies the proportional gain of the controller. PID_3Step does not work with a
negative proportional gain. Control logic is inverted under Basic settings > Controller type.
Integration time
The integration time determines the time behavior of the integral action. The integral action is
deactivated with integration time = 0.0.
Derivative action time
The derivative action time determines the time behavior of the derivative action. Derivative
action is deactivated with derivative action time = 0.0.
Derivative delay coefficient
The derivative delay coefficient delays the effect of the derivative action.
148
Integration time
Derivative delay coefficient (derivative delay T1 = a × T
Derivative action time
Derivative action weighting
)
D
Function Manual, 03/2017, A5E35300227-AC
PID control