Mitsubishi Electric MELSEC iQ-R Series User Manual page 244

CH1 Feed forward control READY flag
When one of the following conditions is met while the action conditions of the disturbance suppression function have been
met, this flag turns ON.
Condition
The deviation (E) enters the disturbance judgment position and the process value (PV) is judged to be stable enough (It may take about 60 seconds to judge
the stability.).
When the deviation enters within a half range of the disturbance judgment position under the following conditions:
• The deviation enters the disturbance judgment position due to the rise of the temperature process value (PV).
• The deviation enters the disturbance judgment position due to the fall of the temperature process value (PV).
This flag is disabled when the deviation (E) enters within the half range of the disturbance judgment position
due to the following causes:
• Changing the set value (SV)
• Changing the setting mode to the operation mode
• At the completion of auto tuning
For details on the disturbance suppression function, refer to the following:
Page 117 Disturbance Suppression Function
'CH1 Set value (SV)
setting' (Un\G430)
'CH1 Disturbance
judgment position'
(Un\G553)
(1) Because the deviation (E) is within the 1/2 disturbance judgment width, 'CH1 Feed forward control READY flag' (Un\G417) turns ON.
(2) The disturbance suppression function starts.
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory area name
CH Feed forward control READY flag
CH Feed forward control READY flag (in the Q compatible mode)
■Turning OFF 'CH1 Feed forward control READY flag' (Un\G417)
At the following timing, 'CH1 Feed forward control READY flag' (Un\G417) turns OFF.
• At power-ON
• During the disturbance suppression
• When the action conditions of the disturbance suppression function have not been satisfied
• When the temperature process value (PV) has responded in a reverse direction of the disturbance judgment position and
goes outside the disturbance judgment width
• When the setting of 'CH1 Feed forward value tuning selection' (Un\G561) is changed from No automatic setting (0) to
Automatic setting (1) (The tuning is executed on the disturbance after the change.)
■Precautions
This function uses a noise filter to avoid a false detection for the disturbance judgment.
Thus, if the temperature fluctuation caused by disturbance is steep in terms of time, the disturbance judgment may delay.
APPX
242
Appendix 3 Buffer Memory Areas
(1)
(2)
(1)
1/2 disturbance judgment range
CH1 CH2
417 617
1458 1459
Disturbance
judgment
range
CH3 CH4
817 1017
1460 1461