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12
TROUBLESHOOTING
12.2 Troubleshooting Flowchart
12.2.4 When the "ALIVE" LED does not turn on or turns off
12 - 8
9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
11
MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
(2) When the "ALIVE" LED of the CPU module turns off during operation of the
programmable controller
The "ALIVE" LED of the CPU module may turn off when
(a) the CPU module detects the hardware failure, or
(b) the power supply module, CPU module, or intelligent function module is mounted
to/removed from the base unit while the power is ON. In this case, the CPU
module detects a "POWER SUPPLY ERROR" (error code: 8080).
When the "ALIVE" LED turns off, the CPU module forcibly goes into the stop status.
In this case, the communications with GX Developer cannot be guaranteed. Turn on the
power supply again or reset the CPU module with RUN/STOP/RESET switch.
If the problem is not improved after performing the operation above, please consult your
local Mitsubishi representative, explaining a detailed description of the problem.