Siemens SIMATIC S7-1200 Function Manual page 126

Using PID_3Step
5.2 PID_3Step V2
PID parameters V2
The PID parameters are displayed in the "PID Parameters" configuration window. The PID
parameters will be adapted to your controlled system during controller tuning. You do not
need to enter the PID parameters manually.
The PID algorithm operates according to the following equation:
Symbol
Δy
K
p
s
b
w
x
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)
126
Description
Output value of the PID algorithm
Proportional gain
Laplace operator
Proportional action weighting
Setpoint
Process value
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