Flowchart For When The "Mode" Led Does Not Turn On - Mitsubishi Q01CPU User Manual

12
TROUBLESHOOTING

12.2.3 Flowchart for when the "MODE" LED does not turn on

The following shows the flowchart for when the "MODE" LED of the CPU module does not
turn on at programmable controller power-on.
The "MODE" LED has not turned on
"POWER" LED of the power
Is the wiring of the power
Connect peripheral device and CPU module.
CPU communicate with the
properly? (Isn't IN connected to
Replace the power supply module and
confirm that the "POER" LED is turned on
green.
Can "MODE" LED turn on?
A hardware fault may have occurred in
any of the following modules.
1) CPU module
2)
Main base unit, extension base unit
3) Extension cable
4) I/O Module (If one is installed)
5) Intelligent function module
(If one is installed)
6) Network module (If one is installed)
Perform operations in due order, starting
with the minimum system where the power
supply module and CPU module are
mounted on the main base unit.
If the module will not work, please consalt
your local nearest Mitsubishi or
representative, explaining a detailed
description of the problem.
How is the
Off or On (red)
supply module?
On (green)
Are all
the power
supply modules powered
NO
on?
supply module
correct?
YES
Can the
YES
peripheral device?
NO
Is the extension
NO
cable connected
IN or OUT connected to
OUT?)
YES
Is the CPU module
RESET position
RESET/L. CLR switch in
the neutral position?
Neutral position
YES
NO
* : This applies to the redundant power supply module.
Diagram 12.3 Flowchart for when the "MODE" LED is not turned on
12.2.3 Flowchart for when the "MODE" LED does not turn on
(When off)
Section 12.2.5
Section 12.2.5 Flowchart for
when the "POWER" LED
turns off.
(When on (red))
Section 12.2.6
Section 12.2.6 Flowchart for
when the "POWER" LED turns
on (red).
Check the wiring and power on all the
power supply modules.
NO
Can "MODE" LED turn on?
Carry out PLC diagnostics, and
perform troubleshooting according to
the diagnostics result.
Connect the extension cable properly.
NO
Can "MODE" LED turn on?
After resetting the CPU with the
RESET/L.CLR switch, set the
RESET/L.CLR switch to the neutral position.
NO
Can "MODE" LED turn on?
Hardware fault of power supply module.
12.2 Troubleshooting
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YES
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YES
YES
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