Flow For Actions When The Cpu Module Is Not Started Up - Mitsubishi Electric MELCEC Q Series User Manual

11. TROUBLESHOOTING

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

The following shows the flow when the CPU module is not started up.
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 RESET/L.CLR 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
Section 11.2.2
(Refer to .)
Review the wiring and turn all the power
supplies 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?
Set the RESET/L.CLR switch to the center
position.
NO
Is CPU module up?
Hardware error of the power
11 - 11
YES
YES
YES
Complete