The Q64Tc Actions - Mitsubishi Electric MELSEC Q Series User Manual

1 GENERAL DESCRIPTION

1.3.2 The Q64TC actions

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The Q64TC performs PID operations in reverse action and forward action.
(1) Reverse action
In a reverse action, the process 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 process value (PV) decreases toward the set value (SV)
as the manipulated value (MV) increases.
The forward action is effective for cooler control.
Temperature
(when used for heat control)
Fig. 1.7 Process control example in reverse action and forward action
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Set
Temperature
value
Process value
Time
Reverse action
MELSEC-Q
Process value
Set
value
Time
Forward action
(when used for cooling control)
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