Mitsubishi Electric MELSEC iQ-R Series User Manual page 85

Checking that the alert has been cleared
When the temperature process value (PV) has returned to within the setting range, CH1 Rate alarm upper limit (Un\G401, b4)
or CH1 Rate alarm lower limit (Un\G401, b5) turns OFF. In addition, 'CH1 Alert flag' (XC) turns off and the ALM LED turns
OFF.
For 'CH1 Alert flag' (XC) and the ALM LED, the alert is not cleared when an alert other than rate alarms has
occurred.
Temperature
process
value (PV)
Change of
temperature
process value
(PV) ( )
'CH1 Rate alarm upper limit'
(Un\G401, b4)
'CH1 Rate alarm lower limit'
(Un\G401, b5)
'CH1 Alert flag'
OFF
(XC)
Temperature
process
Rate alarm
value (PV)
detection
period
Rate alarm
detection
period
Change of
temperature
process
value (PV)
ON
OFF
OFF
ON
Time
Rate alarm
upper limit
value
Rate alarm
lower limit
value
Time
ON
ON
Executed by the temperature control module
1 FUNCTIONS
1.26 Rate Alarm Function
1
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