List Of Alarm Codes - Mitsubishi Electric MELSEC iQ-R User Manual

3.5

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
3 is used to correspond to CH1 to 4.
(CH1: 0, CH2: 1, CH3: 2, CH4: 3)
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)
0B00H Operating condition setting
error during continuous
logging
0D00H Mode switching request
error
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.
'Operating condition setting request' (Y9) has been
turned on during continuous logging operation.
Mode switching has been attempted in the situation
where it is not allowed.
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.
■Simultaneous conversion mode, inter-module
synchronization mode
'Operating condition setting request' (Y9) cannot be
turned on during continuous logging operation.
Therefore, stop the continuous logging before
turning on 'Operating condition setting request'
(Y9).
■Normal mode (high speed: 1s/CH)
'Operating condition setting request' (Y9) cannot be
turned on during high speed continuous logging
operation. Therefore, stop the high speed
continuous logging before turning on 'Operating
condition setting request' (Y9).
When the module satisfies any of the following
conditions, the switching to the offset/gain setting
mode is not allowed.
• The inter-module synchronization target module
is set.
• The operation mode is set to the normal mode
(high speed: 1s/CH).
• The operation mode is set to the simultaneous
conversion mode.
When performing the offset/gain setting, set the
module as a synchronization non-target in the
system parameters, or change the operation mode
to the normal mode (medium speed: 10s/CH) or
normal mode (low speed: 20s/CH). Then shift to
the offset/gain setting mode.
Turn on and off 'Error clear request' (YF) to clear
the alarm.
3 TROUBLESHOOTING
3.5 List of Alarm Codes
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