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(4) Operation with starting ST
This section explains the operation of when the temperature control is started or the set value (SV) is changed
(starting ST).
With starting ST, the module monitors the response waveform of the temperature process value (PV) of when the
temperature control is started or when the set value (SV) is changed. Then PID constants are automatically
corrected. The following table lists the operations of the module with starting ST.
Operation with starting ST
1
CH
PID auto-correction status (b0 of Un\G575, Un\G607, Un\G639, Un\G671) is turned 0 (OFF). In addition,
CH
Auto tuning status (Xn4 to Xn7) is turned on.
2 Temperature is controlled using the PID constants set.
3
When a control response is poor, PID constants are calculated based on the response waveform and are set in
the buffer memory. In addition, CH
PID auto-correction status (b0 of Un\G575, Un\G607, Un\G639, Un\G671) is
turned 1 (ON). When a control response is good, CH
PID auto-correction status (b0 of Un\G575, Un\G607,
Un\G639, Un\G671) remains 0 (OFF) and PID constants are not changed.
4
CH
Auto tuning status (Xn4 to Xn7) is turned off.
ON
OFF
OFF
PID constants
Time
After changeBefore change (Only for poor response)
Response measurement/evaluation
Self-tuning in execution
ON
CH PID auto-correction status
(b0 of Un\G575, Un\G607,
Un\G639, Un\G671)
CH Auto tuning status
(Xn4 to Xn7)
(Only when PID constants were changed)
Temperature process value (PV)
Set value (SV)
Control start
Executed by the Q64TCN