Integral Operation (I Operation) - Mitsubishi MELSEC-Q series Programming Manual

1.4.2

Integral operation (I operation)

This section explains the control method using integral operation.
(1) Integral operation is the operation that continuously changes the manipulated value to eliminate deviation when there is
deviation.
This operation can eliminate the offset that occurs during control performed by a proportional operation.
(2) The time required for adjusting the manipulated value of the integral operation to the manipulated value of the
proportional operation after the deviation is detected is called integral time (T
(a) Increasing the integral time decreases the effect of integration.
(It will take time to stabilize.)
(b) Decreasing the integral time increases the effect of integration.
However, since the integral operation will be stronger, hunting may become greater.
(3) The integral operation in the case of a step response with a constant deviation will be as follows.
(4) The integral operation is used as the PI operation that is combined with the proportional operation or as the PID
operation that is combined with the proportional operation and the derivative operation.
Control cannot be carried out by merely performing the integral operation.
DV
Time
Proportional operation integral operation manipulated value
Integral operation manipulated value
K DV
Manipulated value in the proportional operation
P
T
I
Time
).
I
1
2
3
4
3
6
7
8
15