Alert Output Function; Process Alarm - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.6

Alert Output Function

This section describes process alarms and rate alarms used for the alert output function.

Process alarm

This function outputs an alert when a measured temperature value enters the preset alert output range.
Measured temperature value
Upper upper limit value
Upper lower limit value
'CH1 Measured temperature
value' (Un\G400)
Lower upper limit value
'CH2 Measured temperature
value' (Un\G600)
Lower lower limit value
'CH1 Alert output flag
(Process alarm upper limit)'
(Un\G36, b0)
'CH1 Alert output flag
(Process alarm lower limit)'
(Un\G37, b0)
'CH2 Alert output flag
(Process alarm upper limit)'
(Un\G36, b1)
'Alert output signal' (XD)
Operation
■Operation performed when an alert is output
When a measured temperature value is equal to or greater than the process alarm upper upper limit value, or the value is
equal to or smaller than the process alarm lower lower limit value and the value enters the alarm output range, an alert is
output as follows.
• Alarm ON (1) is stored in 'Alert output flag (Process alarm upper limit)' (Un\G36) or 'Alert output flag (Process alarm lower
limit)' (Un\G37).
• 'Alert output signal' (XD) turns on.
• The ALM LED turns on.
• An alarm code is stored in 'Latest alarm code' (Un\G2). ( Page 87 List of Alarm Codes)
The temperature conversion on a channel where an alert was output continues.
■Operation after an alert was output
After an alert was output, if the measured temperature value becomes smaller than the process alarm upper lower limit value
or greater than the process alarm lower upper limit value, Normal (0) is stored in a bit position corresponding to the channel
number of 'Alert output flag (Process alarm upper limit)' (Un\G36) or 'Alert output flag (Process alarm lower limit)' (Un\G37).
Alert
Alert
Alert cleared
ON
OFF
ON
ON
Alert output range
Out of alert output range
Included
Alert cleared
Alert cleared
Alert
ON
OFF
OFF
OFF
Time
1 FUNCTIONS
1.6 Alert Output Function
1
27