Chapter 9 Troubleshooting; Troubleshooting; The Run Led Is Not On; The I/O Status Indicator Led Is Not On - Mitsubishi Electric MELSEC iQ-R Series User Manual

9

TROUBLESHOOTING

9.1
Troubleshooting

The RUN LED is not on.

Check item
Check whether power is supplied to the power supply module.
Check whether the capacity of the power supply module is enough.
Check whether the module is mounted properly.
Cases other than the above

The I/O status indicator LED is not on.

Check item
Check whether external power supply is supplied to the I/O module.
Try forced on on the device concerned by using the engineering tool.
Action
Check that the supply voltage to the power supply module is within the rated
range.
Calculate the current consumption of mounted modules, such as the CPU
module, I/O modules, and intelligent function modules to check that the power
capacity is enough.
Check the mounting state of the module.
Reset the CPU module and check if the RUN LED turns on.
If the RUN LED still remains off, the possible cause is a failure of the module.
Please consult your local Mitsubishi representative.
Action
Check that the supplied power meets the voltage specifications of the I/O
module used.
Perform forced on/off on the device concerned to check the correspondence
between the device state and the I/O indicator LED.
If the error of the I/O indicator LED still persists, the possible cause is a failure
of the module. Please consult your local Mitsubishi representative.
9 TROUBLESHOOTING
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9.1 Troubleshooting
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