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1.3.2 The Q64TCN actions
The Q64TCN performs PID operations in forward actions and reverse actions.
(1) Forward action
In a forward action, the manipulated value (MV) is increased when the temperature process value (PV) increases
from the set value (SV).
A forward action is used for cooling control.
(2) Reverse action
In a reverse action, the manipulated value is increased when the temperature process value (PV) decreases from
the set value (SV).
A reverse action is used for heating control.
Manipulated
value
Manipulated
value
Temperature Temperature
Time
Time
Time
Time
Set value < Starting temperature Set value > Starting temperature
Set
value
Set
value
Manipulated
value
Temperature
Time
Time
Time
Time
Manipulated
value
Temperature
Set
value
Set value > Starting temperature Set value < Starting temperature
Set
value