Omron MX2 Series User Manual page 382

7 Other Functions
PID Operation
(1) P Operation
In this operation, the control volume is proportional to the deviation (difference between the
target value and the current value).
(2) I Operation
In this operation, the control volume is proportional to the time integral value of the deviation. The
P operation is less effective as the current value approaches the target value due to smaller devia-
tion, taking a long time to reach the target value. The I operation compensates this disadvantage.
(3) D Operation
In this operation, the control volume is proportional to the percentage of change in the devi-
ation. Because using only the PI operation is time-consuming, the D operation is used to
effectively compensate for the disadvantage in responsiveness.
PID Target Value Setting Unit and PID Scale
When the PID function is enabled, the setting unit for the following parameters is changed to percent-
age as 100% of the maximum frequency (d004 is always in units of %).
You can set the PID Scale (A075) to perform scale conversion of these parameters:
Value after conversion = Value before conversion
d004 F001
A023 A024
A031 A032
Precautions for Correct Use
When the following parameters are read or written via Modbus communication, the data unit
differs between read and write operations. Set parameter values in units of 0.01 Hz for writing
and in units of the following percentages (as 100% of the maximum frequency) for reading.
7 - 46
A011 A012 A020
A025 A026 A027
A033 A034 A035
Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)
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PID Scale (A075)
A220 A021 A022
A028 A029 A030
A101 A102 A145