List Of Alarm Codes - Mitsubishi Electric Melsec iQ-R Series User Manual

4.5

List of Alarm Codes

If an alarm occurs during operation, the A/D converter module stores the alarm code into 'Latest alarm code' (Un\G2) of the
buffer memory. Turning on 'Error clear request' (YF) allows clearing of the alarm code of 'Latest alarm code' (Un\G2).
The following table lists the alarm codes that may be stored.
 in an alarm code: This symbol indicates the number of the channel where an alarm has occurred. A numerical value of 0 to
7 is used to correspond to CH1 to 8.
(CH1: 0, CH2: 1, CH3: 2, CH4: 3, CH5: 4, CH6: 5, CH7: 6, CH8: 7)
Alarm code Alarm name
080H Process alarm (upper limit)
081H Process alarm (lower limit)
082H Rate alarm (upper limit)
083H Rate alarm (lower limit)
090H Input signal error detection
(upper limit)
091H Input signal error detection
(lower limit)
0A0H Input signal error detection
(disconnection)
4 TROUBLESHOOTING
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4.5 List of Alarm Codes
Description and cause
The process alarm (upper limit) has occurred in
CH.
The process alarm (lower limit) has occurred in
CH.
The rate alarm (upper limit) has occurred in CH.
The rate alarm (lower limit) has occurred in CH.
An input signal error (upper limit) has been detected
in CH.
An input signal error (lower limit) has been detected
in CH.
An input signal error (disconnection) has been
detected in CH.
Action
Adjust CH Digital operation value to fall within the
range. As a result, the corresponding bit of CH
Warning output flag (Process alarm upper limit) or
CH Warning output flag (Process alarm lower
limit), and 'Warning output signal' (X8) turn off
automatically.
Adjust the change rate in CH Digital output value
to fall within the range. As a result, the
corresponding bit of CH Warning output flag
(Rate alarm upper limit) or CH Warning output
flag (Rate alarm lower limit), and 'Warning output
signal' (X8) turn off automatically.
The following operations are performed by turning
on and off 'Error clear request' (YF) after the analog
input value returns within the setting range.
• All bits of Input signal error detection flag turn to
Normal (0).
• 'Input signal error detection signal' (XC) turns off.
• 'Latest alarm code' (Un\G2) is cleared.