Flow For Actions When The Cpu Module Is Not Started Up - Mitsubishi MELSEC-A A2USHCPU-S1 User Manual

11. TROUBLESHOOTING

11.2.9 Flow for actions when the CPU module is not started up

The flow when the CPU module is not started up is described.
The CPU module is not started up.
Is the power supply
module LED ON?
Are all the power of the power
supply modules ON? Is the power supply
module wired correctly?
Try to connect the peripheral device.
Is it available
to communicate with
the peripheral device?
Is the extension cable
connected to the incorrect
direction? (Connected IN and
IN, or OUT and OUT?)
Is the RUN/STOP key
switch of the CPU
module at RESET?
Switch the power supply module and
confirm the LED lights.
Is CPU module up?
Possible hardware errors are described below.
1) CPU module
2)Main base unit, Extension base unit
3)Extension cable
4)Network module (Only when installed)
For the malfunctioning module even after executed the serial
operation check from the minimum system, please consult
your local Mitsubishi service center or representative,
explaining a detailed description of the problem.
NO
YES
NO
YES
YES
NO
YES
NO
at RESET
Not at RESET
YES
NO
See Flowchart for actions when the
"POWER" LED is turned OFF
(Refer to Section 11.2.2
Review the wiring and turn the all
power supply ON.
NO
Is CPU module up?
Make the PLC diagnosis, and execute
the troubleshooting according to the
result.
Connect the extension cable.
NO
Is CPU module up?
Switch the RUN/STOP key switch
to RUN.
NO
Is CPU module up?
Hardware error of the power supply
11 - 10
.)
YES
YES
YES
Complete