Mitsubishi Electric MELSEC iQ-R Series User Manual page 80

Alert with re-wait
A function to deactivate the alert function once again when the set value (SV) is changed is added to an alert with wait. This is
called an alert with re-wait.
When a control that changes the set value (SV) is executed, the alert that is supposed to occur can be avoided when the set
value (SV) is changed by selecting an alert with re-wait.
Ex.
When the temperature process value (PV) is at the position shown as below before the set value (SV) change
Before set value
(SV) change
After set value
(SV) change
*1 Depending on the set alert mode, this value becomes the set value or the monitored value. ( Page 73 Setting the set value (SV) and
the setting variation rate limiter)
When the set value (SV) of a deviation alert is changed, the temperature process value (PV) goes into the alert area. Thus,
the system goes into an alert status. To prevent the case above, alert outputs can be suspended.
■Setting method
Select one of the following alert modes:
Alert mode setting
Setting value
12
13
14
22
23
24
When "Setting change rate limiter setting" in "Base Setting" has been set, an alert with re-wait cannot be enabled even though
one of the following alert modes is selected.
Alert mode setting
Setting value
12
13
14
The re-wait function is used to prevent the occurrence of an alert when the set value (SV) is changed.
When "Setting change rate limiter setting" in "Base Setting" has been set, the value in 'CH1 Set value (SV) monitor'
(Un\G406) follows the set value (SV) and gradually changes when the set value (SV) is changed. When it is supposed that the
re-wait function is enabled under such a situation, the re-wait function would be always active, and an alert would not be
output even while the temperature process value (PV) is not following the value in 'CH1 Set value (SV) monitor' (Un\G406). To
prevent such cases, the re-wait function is disabled when a setting variation rate limiter is used.
1 FUNCTIONS
78
1.25 Alert Function
Temperature process value (PV)
Alert region
Alert set value
Temperature process value (PV)
Alert region
Alert set value
Alert mode name
Upper limit deviation alert with re-wait
Lower limit deviation alert with re-wait
Upper lower limit deviation alert re-wait
Upper limit deviation alert with re-wait (use set value (SV) setting value)
Lower limit deviation alert with re-wait (use set value (SV) setting value)
Upper/lower limit deviation alert with re-wait (use set value (SV) setting value)
Alert mode name
Upper limit deviation alert with re-wait
Lower limit deviation alert with re-wait
Upper/lower limit deviation alert with re-wait
Set value (SV)
Set value
(SV) change
Set value (SV)
*1