172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
208
[Example]
The “AT remaining time monitor” is a predictive value and may not be accurate.
AT/ST status monitor
Displays the execution status of Autotuning (AT).
Displays “1” during Autotuning (AT).
Displays “0” when Autotuning (AT) is completed.
When Autotuning (AT) is aborted, the display shows -1 up to -4 depending on
the reason of the abort.
-1: Aborted. Setting changed.
・
When the set value (SV) is changed.
・
When the AT bias is changed.
・
When the PV bias, PV ratio, or PV digital filter is changed.
・
When the Output limiter high or low is changed.
・
When Autotuning (AT) is changed to PID control.
・
When the instrument is switched to STOP by RUN/STOP transfer.
・
When the instrument is switched to Manual mode using Auto/Manual
transfer.
・
When the instrument is switched to Remote mode using
Remote/Local transfer.
・
When the instrument is switched to Cascade/Single.
・
When the memory area is changed.
-2: Aborted. Abnormal input.
・
When the Measured value (PV) has entered the Input error range.
[Input error range: Input error determination point high
Measured
value (PV), Input error determination point low
Measured value (PV)]
・
When the Feedback resistance (FBR) input is broken
-3: Aborted. Timeout.
Output state has not been changed (ON to OFF, OFF to ON) for more
than two hours.
-4: Aborted. Abnormal calculated values.
Error in the calculation of the values in Cascade control and Control with
PV select.
Caution for using Autotuning (AT)
When a temperature change (UP and/or Down) is 1
C or less per minute during
Autotuning (AT), Autotuning (AT) may not be finished normally. In that case,
adjust the PID values manually. Manual setting of PID values may also be
necessary if the set value is around the ambient temperature or is close to the
maximum temperature achieved by the load.
1.ATTM
TCAL
2:00
remaining time monitor
Input 1_AT
1.ATTM
remaining time monitor
Input 1_AT
Calculating the
remaining time
The remaining
time is displayed
Содержание SC-F71
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