Mitsubishi Melsec-Q Series User Manual page 298

12.2 Troubleshooting
This section describes how to identify errors, details of errors, and measures to eliminate the errors.
12.2.1 Troubleshooting flowchart
The following shows the contents of the troubles according to the types of
Error description
ERR. terminal has turned off (opened).
LIFE OUT terminal of the Life detection power
supply module has turned off.
MODE LED does not turn on.
MODE LED is flickering.
POWER LED has turned off.
POWER LED of the Life detection power
supply module is flickering in orange.
POWER LED of the redundant power supply
module has turned on in red.
LIFE LED of the Life detection power supply
module has turned off.
LIFE LED of the Life detection power supply
module has turned on in red.
LIFE LED of the Life detection power supply
module is flickering in red.
RUN LED has turned off.
RUN LED is flickering.
ERR. LED has turned on or is flickering.
USER LED has turned on.
BAT.LED has turned on
or is flickering.
BOOT LED is flickering.
LEDs of the output module do not turn on.
I/O modules do not operate normally.
Unable to read a program.
Unable to write a program.
Program is rewritten unintentionally.
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Note1
Basic
Note12.2
The Basic model QCPU does not have the following LEDs.
MODE LED
USER LED
BAT. LED
BOOT LED
12 - 3
Section 12.2.2
Section 12.2.3
Section 12.2.4
Note12.2
Section 12.2.5
Section 12.2.6
Section 12.2.7
Section 12.2.8
Section 12.2.9
Section 12.2.10
Section 12.2.11
Section 12.2.12
Section 12.2.13
Section 12.2.14
Note12.2 Section 12.2.15
Note12.2
Section 12.2.16
Section 12.2.17
Note12.2
Section 12.2.18
Section 12.2.19
Section 12.2.20
Section 12.2.21
Section 12.2.22
events.Note1
When the ERR. Terminal (negative logic) has
turned off (opened)
When the LIFE OUT terminal (negative logic) has
turned off
When the MODE LED does not turn on
When the MODE LED is flickering
When the POWER LED has turned off
When the POWER LED is flickering in orange
When the POWER LED has turned on in red
When the LIFE LED has turned off
When the LIFE LED has turned on in red
When the LIFE LED is flickering in red
When the RUN LED has turned off
When the RUN LED is flickering
When the ERR. LED has turned on or is flickering
When the USER LED has turned on
When the BAT.LED has turned on or is flickering
When the BOOT LED is flickering
When the LEDs of the output module do not turn on
When output load of the output module does not
turn on
When unable to read a program
When unable to write a program
When a program is rewritten unintentionally