70
3 TROUBLESHOOTING
3.5 List of Alarm Codes
3.5
List of Alarm Codes
If an alarm occurs during operation, the I/O module with diagnostic functions stores the corresponding alarm code in the
buffer memory area 'Latest alarm code' (Un\G2564).
If an alarm has occurred, take actions against the alarm, such as reviewing connected devices, wiring, and voltage and
replacing connected external devices. After the alarm cause is eliminated, turn on 'Alarm clear request' (Y11) to clear the
alarm code in 'Latest alarm code' (Un\G2564). If the alarm occurs again, the possible cause is a failure of the module. Please
consult your local Mitsubishi representative.
The following table lists alarm codes to be stored.
in an alarm code: Indicates the number of an I/O terminal in which the alarm has occurred. In accordance with X0 to XF
(input module) or Y0 to YF (output module), a numerical value of 0 to F is assigned.
Alarm code
Alarm name
Alarm description and cause
Action
80
H
Number of input ON times alarm
detection count reached
The number of input ON times has reached the
number of input ON times alarm detection
count.
Set the corresponding bit of Number of input
ON times value clear request to 1 (Requested)
to clear the number of input ON times.
88
H
Input disconnection detection
A disconnection has been detected.
After a connection is recovered, turn on and off
'Alarm clear request' (Y11). The value 0
(Normal) is set in all Input disconnection
detection status, 'Alarm flag' (X11) turns off, and
the alarm code in Latest alarm code is cleared.
90
H
Number of output ON times alarm
detection count reached
The number of output ON times has reached
the number of output ON times alarm detection
count.
Set the corresponding bit of Number of output
ON times value clear request to 1 (Requested)
to clear the number of output ON times.
98
H
Output disconnection detection
A disconnection has been detected.
After a connection is recovered, turn on and off
'Alarm clear request' (Y11). The value 0
(Normal) is set in all Output disconnection
detection status, 'Alarm flag' (X11) turns off, and
the alarm code in Latest alarm code is cleared.
A0
H
Output short-circuit detection
A short-circuit has been detected.
After the recovery from the short-circuit, turn on
and off 'Alarm clear request' (Y11). The value 0
(Normal) is set in all Output short-circuit
detection status, 'Alarm flag' (X11) turns off, and
the alarm code in Latest alarm code is cleared.
Summary of Contents for MELSEC iQ-RX40NC6B
Page 1: ...MELSEC iQ R I O Module With Diagnostic Functions User s Manual Application RX40NC6B RY40PT5B ...
Page 2: ......
Page 125: ...4 OVERVIEW 123 4 MEMO ...
Page 191: ...12 MAINTENANCE AND INSPECTION 189 12 MEMO ...
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