Actions In The Q62Hlc - Mitsubishi Electric MELSEC-Q Series User Manual

1 OVERVIEW

1.3.2 Actions in the Q62HLC

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The Q62HLC performs PID operations in reverse action and forward action.
(1) Reverse action
In a reverse action, the measured value (PV) increases toward the set value (SV)
as the manipulated value (MV) increases.
The reverse action is effective for heat control.
(2) Forward action
In a forward action, the measured value (PV) decreases toward the set value
(SV) as the manipulated value (MV) increases.
The forward action is effective for cooling control.
Temperature
(when used for heat control)
Fig. 1.6 Process control example in reverse action and forward action
Set
value
Process value
Time
Reverse action
Temperature
Process value
Forward action
(when used for cooling control)
MELSEC-Q
Set
value
Time
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