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142
PARAMETERS
(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.
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.
3) PID action
[Operation example for stepped changes of process value]
Note: PI action is the sum of P and I actions.
[Operation example for proportional changes of process value]
Note: PD action is the sum of P and D actions.
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 P and I and D actions.
Time
Time
Time
Process value
P action
I action
PI action
Deviation
Set point
Time
Time
Time
Deviation
P action
D action
PD action
Set point
Process
value
PID action
I action
y=at
2
+ bt + c
Time
Deviation
P action
D action
Set point
Process
value
Time
Time
Time