User`s manual

Troubleshooting Troubleshooting
11 – 24
* For the Basic model QCPU, check the RUN/STOP/RESET switch of CPU module
(From previous page)
POWER LED off: section 11.2.4
POWER LED on (red):(redundant
power supply modules only): section
11.2.6
Communication
enabled?
Check the wiring and power on all the
power supply modules.
Connect the extension cable properly.
Cancel the RESET.
Completed
A hardware fault may have occurred in any of the following
modules:
 Main base unit/extension base unit
 Extension cable
 CPU module
 I/O Module or intelligent function module
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.
For the module that does not operate, please consult your local
Mitsubishi service center or representative, explaining a
detailed discription of the problem.
Is the POWER LED of
the power supply module lit
(green)?
Is the extension cable con-
nected properly?
(OUT -> IN)
Position of the
RESET/L.CLR switch*
of the CPU
NO
NO
NO
NO
Other than RESET position
YES
YES
RESET position
YES
YES
YES
Hardware fault of power supply module.
Replace the power supply module and
confirm that the POWER LED is turned
on green.
NO
YES
NO
Are all the power
supply modules powered on?
Is the wiring of the power supply
module correct?
NO
YES
Communication
enabled?
Communication
enabled?
Communication
enabled?