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(6) Conditions where self-tuning is not executed
This section explains the conditions where self-tuning is not executed.
(a) The control method is not the PID control method.
When the control method is other than the PID control method, and any of the four methods (two-position
control, P control, PI control, PD control), self-tuning is not executed. CH Self-tuning disable status (b8 of
RWr14 to RWr17) turns 1 (ON).
When all PID constants of target channels turn to a value other than 0, self-tuning is enabled.
Temperature process value (PV)
Set value (SV)
CH□ Proportional band (P) setting
(address: 102H, 132H, 162H, 192H)
CH□ Integral time (I) setting
(address: 103H, 133H, 163H, 193H)
CH□ Derivative time (D) setting
(address: 104H, 134H, 164H, 194H)
CH□ Self-tuning disable status
(b8 of RWr14 to RWr17)
CH□ PID auto-correction status
(b0 of RWr14 to RWr17)
(b) Auto tuning is being executed.
During auto tuning, self-tuning is not executed. (No error occurs.) At the time of when auto tuning is completed,
self-tuning is enabled.
(c) The lower limit output limiter value is lower than the manipulated value (MV) and the
manipulated value (MV) is lower than the upper limit output limiter value when the
temperature control is started and the set value (SV) is changed.
The starting ST does not start. However, self-tuning is enabled at the time of when a control response becomes
oscillatory under the following setting.
• CH Self-tuning setting (address: 2C0H to 2C3H) is set to Starting ST plus vibration ST (4).
Oscillation detected
Self-tuning disabled
Setting ≠ 0
Setting = 0
Setting = 0
Setting = 0
ON
ON
(Depends on previous execution result)
CHAPTER 8 FUNCTIONS
During self-tuning
Setting ≠ 0
Setting ≠ 0
OFF
OFF
Time
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Troubleshooting
