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12.2 Troubleshooting Flowchart
12.2.4 When the "ALIVE" LED does not turn on or turns off
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TROUBLESHOOTING
(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 in the following cases.
(a) When the CPU module detects the hardware failure.
When the power supply module, CPU module, CC-Link Safety master module,
and network module are 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 service center or representative, explaining a detailed description of the
problem.
