Pid_3Step Instruction - Siemens SIMATIC S7-1200 Manual

PID is easy

8.3 PID_3STEP instruction

Figure 8-2
8.3 PID_3STEP instruction
The PID controller uses the following formula to calculate the output value for the PID_3Step
instruction.
Δ y = K
y
w
K
p
T
1
T
D
170
Operation of the PID_Compact controller as a PIDT1 controller with anti-windup
[
· s · (b · w - x) +
p T
Output value
Setpoint value
Proportional gain
(P component)
Integral action time
(I component)
Derivative action time
(D component)
1 T · s
D
(w - x) +
· s a · T · s + 1
I D
x
s
a
b
c
]
(c · w - x)
Process value
Laplace operator
Derivative delay coefficient
(D component)
Proportional action weighting
(P component)
Derivative action weighting
(D component)
Manual, 11/2011, A5E02486774-04
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