Mitsubishi Electric MELSEC iQ-R Series User Manual page 82

■Alert set value
According to a selected alert mode, set the temperature at which CH1 Alert 1 (Un\G401, b8) to CH1 Alert 4 (Un\G401, b11)
turn ON. Up to 4 items can be set.
Set "Alert set value 1" to "Alert set value 4" by the following procedure:
Alert set values 1 to 4 correspond to the alert modes of Alert 1 to 4.
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Alert setting]
Setting an alert dead band
When the temperature process value (PV) or deviation (E) is close to the alert set value, the status may changes repeatedly
between the alert status and non-alert status due to inconsistent inputs.
In this case, by setting an alert dead band, repetition of the status change caused by inconsistent inputs can be prevented.
■Setting method
Configure the setting as follows:
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Alert setting]  [Alert dead band
setting]
Ex.
When the alert mode has been set to "Upper Limit Input Alert"
When a value other than 0 has been set for "Alert dead band setting" of "Alert setting" in "Application Setting," the system
issues an alert when the input upper limit becomes equal to or greater than the alert set value. When the value becomes
equal to or smaller than the alert dead band, the status changes to the non-alert status. (lower right figure)
When 0 has been set for "Alert dead band setting" of "Alert
setting" in "Application Setting"
Temperature process value (PV)
Alert set value
Alert status
1 FUNCTIONS
80
1.25 Alert Function
Time
Non-alert status Alert status
When a value other than 0 has been set for "Alert dead band
setting" of "Alert setting" in "Application Setting"
Temperature process value (PV)
Alert set value
Alert status
Non-alert status
Dead band
Time
Alert status