Pid_Compact V2; Description Of Pid_Compact V2 - Siemens SIMATIC S7-1200 Function Manual

Instructions
9.1 PID_Compact
9.1.4

PID_Compact V2

9.1.4.1

Description of PID_Compact V2

Description
The PID_Compact instruction provides a PID controller with integrated tuning for actuators
with proportional action.
The following operating modes are possible:
● Inactive
● Pretuning
● Fine tuning
● Automatic mode
● Manual mode
● Substitute output value with error monitoring
For a more detailed description of the operating modes, see the State parameter.
PID algorithm
PID_Compact is a PIDT1 controller with anti-windup and weighting of the proportional and
derivative actions. The PID algorithm operates according to the following equation:
Symbol
y
K
p
s
b
w
x
T
I
T
D
a
c
246
Description
Output value of the PID algorithm
Proportional gain
Laplace operator
Proportional action weighting
Setpoint
Process value
Integral action time
Derivative action time
Derivative delay coefficient (derivative delay T1 = a × T
Derivative action weighting
)
D
Function Manual, 03/2017, A5E35300227-AC
PID control