Mitsubishi Electric MELSEC iQ-R Series - When the Specific Q Series Extension Base Unit Cannot be Recognized

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APPX
Appendix 3 Troubleshooting by Symptom
When the specific Q series extension base unit cannot be
recognized
Check the following:
If the specific Q series extension base unit cannot be recognized even after the items above are checked and the actions are
taken, the possible cause is a hardware failure. Please consult your local Mitsubishi representative.
Check item Action
The POWER LED of the power supply module on the Q series extension base
unit that cannot be recognized is off.
Refer to the troubleshooting for the power supply modules. ( User's
Manual (Hardware Design, Maintenance and Inspection) for the Q series CPU
module used)
The connector pin is not correctly inserted in the extension level setting
connector.
Correctly insert the connector pin in the extension level setting connector.
The extension cable is not correctly connected. Correctly connect the extension cable.
The specific Q series extension base unit cannot be recognized even after the
above items were checked.
Take actions in the following order.
• Replace the extension cable.
• Replace the Q series extension base unit.
• Replace the base unit on the upper level of the Q series extension base
unit.