Mitsubishi Melsec-Q Series User Manual page 326

12.2.26 When the CPU module does not start
Refer to the following flowchart when the CPU module does not start upon
The CPU module does not start.
Is the "POWER" LED
of the power supply module
Are all power
supply modules turned on?
Is the power supply module
connected correctly?
Connect peripheral deivce.
Is communication
with peripheral device
succeeded?
Is the direction of
the exension cable correct?
(Check if IN-IN or OUT-OUT
connection is made.)
Is the RESET-L.
CLR switch of the CPU module
in the RESET position?
Change the power supply module and
check if the LED lights up (green).
Does the CPU module start?
The following pleces of hardware may be faulty.
1) CPU module
2) Main base unit, extension base unit
3) Extension cable
4) I/O Module (If one is installed)
5) Interlligent 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 discription of the problem.
Note1
Basic
Note12.14
For the Basic model QCPU, it applied to the CPU module (power supply section) is.
Basic
Note12.15
For the Basic model QCPU, check if the RUN/STOP/RESET switch of CPU module is in the RESET position.
12 - 31
NO
Note12.14
lit (green)?
YES
NO
YES
YES
NO
NO
YES
RESET position
Note12.15
In other than RESET position
YES
NO
Figure 12.23 When the CPU module does not start
power-on.Note1
(When off)
Section 12.2.6
Flowchart for when
the "POWER" LED turns off.
(When on (red))
Section 12.2.8
Flowchart for when
the "POWER" LED turns on (red).
Check the wiring and turn ON all power
supply modules.
NO
Does the CPU module start?
Perform PLC diagnostics and troubleshoot
according to the results of the diagnosis.
Correct the connection of the extension cable.
NO
Does the CPU module start?
Cancel the RESET position.
NO
Does the CPU module start?
Hardware error of power supply
module.
YES
YES
YES
End