Alert Output Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Analog control - intelligent function module
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Alert output function

This section describes process alarms and rate alarms used for the alert output function.
Process alarm
Outputs an alarm when a digital operation value enters the preset alarm output range.
Digital operation value
Upper upper
limit value
Upper lower
limit value
'CH1 Digital operation
value' (Un\G402)
Lower upper
limit value
'CH2 Digital operation
value' (Un\G602)
Lower lower
limit value
'CH1 Warning output flag
(Process alarm upper limit)'
(Un\G36, b0)
'CH1 Warning output flag
(Process alarm lower limit)'
(Un\G37, b0)
'CH2 Warning output flag
(Process alarm upper limit)'
(Un\G36, b1)
'Warning output signal'
(Un\G69, b8)
■Operation
[Operation performed when an alarm is output]
When a digital operation value is equal to or greater than 'CH1 Process alarm upper upper limit value' (Un\G514), or the value
is equal to or smaller than 'CH1 Process alarm lower lower limit value' (Un\G520) and the value enters the alarm output range,
an alert is output as follows.
• Alarm ON (1) is stored in the bit position corresponding to the channel number of 'Warning output flag (Process alarm upper
limit)' (Un\G36) or 'Warning output flag (Process alarm lower limit)' (Un\G37).
• 'Alarm output signal' (Un\G69, b8) turns on.
• The ALM LED turns on.
• An alarm code is stored in 'Latest alarm code' (Un\G2). (Page 106 List of alarm codes)
• The A/D conversion on a channel where an alarm was output continues.
• A cycle to output the process alarm is within 2 ms. When the process alarm is detected multiple times within
2 ms, only the first process alarm detected may be notified as an alert.
1 FX5-4AD
46
1.4 Functions
Alert occurrence
Alert occurrence
ON
ON
Alert output range
Alert output out of range
Included
Alert cleared
Alert occurrence
OFF
ON
ON
Controlled by the analog input module
Alert cleared
Alert cleared
Time
OFF
OFF
OFF

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