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PARAMETERS
121
(
2
)
PID action overview
1) PI action
A combination of proportional control action (P) and integral control action (I) for providing a manipulated
variable in response to deviation and changes with time.
[Operation example for stepped changes of process value]
Note: PI action is the sum of P and I actions.
Time
Time
Time
Process value
P action
I action
PI action
Deviation Set point
2) PD action
A combination of proportional control action (P) and differential control action (D) for providing a
manipulated variable in response to deviation speed to improve the transient characteristic.
[Operation example for proportional changes of process
value]
Note: PD action is the sum of P and D actions.
Time
Time
Time
Deviation
P action
D action
PD action
Set point
Process
value
3) PID action
The PI action and PD action are combined to utilize the advantages of both actions for control.
Note: The PID action is the sum of the P, I and D actions.
Time
Time
Time
Deviation
P action
D action
PID action
Set point
Process
value
Time
I action
y=at +bt+c
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