Mitsubishi Electric QS001CPU User Manual page 115

12
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 when
(a) the CPU module detects the hardware failure, or
(b) the power supply module, CPU module, or intelligent function module is mounted
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.
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).
12.2.4 When the "ALIVE" LED does not turn on or turns off
12.2 Troubleshooting Flowchart
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