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Process control instructions
A PID controller is a combination of a P component, an I component and a D component. When the parameters
Kp, Ti and Td are optimally adjusted, a PID controller can quickly control and maintain a quantity at a
predetermined set value.
Standard
+
Set value (SP)
tolerance e
-
Measurement signal (PV)
Reference equations for calculating the controller output MV
The following equations are used to calculate the controller output MV under the following conditions:
In general:
The output value at time period n is calculated from the previous output value (n-1) and the change in the output
value in this time interval.
Reverse operation PI-D
Forward operation PI-D
940
Integral
+
operation
Derivative
operation
Control = 16#X000
Control = 16#X001
+
Kp
Output (MV)
+
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