PARAMETERS
135
(
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.
Deviation
Set point
Process value
Time
Time
Time
PI action
I action
P action
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.
Deviation
Time
Time
Time
PD action
D action
P action
Process
value
Set point
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 P, I and D actions.
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