Download Temperature Control Module User`s Manual

3 SPECIFICATIONS
MELSEC-Q
(b) Auto tuning operation
Auto tuning performs operation as shown below.
1) Auto tuning output is provided.
2) Data collection starts when the process value returns to the set value after
the first overshoot and undershoot.
3) After data collection, auto tuning ends when PID constants and loop
disconnection detection judgment time are set.
Process value (PV)
The first overshoot and
undershoot are ignored.
End of auto tuning
Set value (SV)
(Temperature set value)
Start of auto tuning
Time
Data collection
Auto tuning in execution
Temperature
control
ON
OFF
Yn4,Yn5,Yn6,Yn7
ON
Xn4,Xn5,Xn6,Xn7
OFF
(c) Precautions for auto tuning
The following indicate the conditions under which auto tuning will result in
abnormal termination.
1) The buffer memory addresses of the corresponding channels have been
changed.
2) The forced PID control stop command (YnC to YnF) was turned on.
3) The setting/operation mode command (Yn1) was turned off. (Except when
the PID continuation flag (buffer memory address: A9H) is "Continue")
4) Switched to the Manual mode (MAN).
5) A hardware error occurred.
6) The temperature process value (PV) fell out of the input range.
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