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When The Specific Extension Base Unit Cannot Be Recognized - Mitsubishi Electric MELSEC iQ-R Series User Manual

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When the specific extension base unit cannot be recognized

When the specific extension base unit cannot be recognized, check the following items.
Check item
Is the extension base unit that cannot be recognized the Q series extension
base unit?
Is the POWER LED of the power supply module of the extension base unit
that cannot be recognized turned off?
Is the extension cable installed correctly?
Can the specific extension base unit be recognized after the above items were
checked?
If the specific 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.
When the specific Q series extension base unit cannot be
recognized
When the specific Q series extension base unit cannot be recognized, check the following items.
Check item
Is the POWER LED of the power supply module of the Q series extension
base unit that cannot be recognized turned off?
Is the POWER LED of the power supply module of the extension base unit
that cannot be recognized turned off?
Is the connector pin for setting the number of extension base units correctly
mounted?
Is the extension cable installed correctly?
Can the specific Q series extension base unit be recognized after the above
items were checked?
If the specific 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.
4 TROUBLESHOOTING
4.6 Troubleshooting by Symptom
Action
Refer to the troubleshooting for the case where the specific Q series
extension base unit cannot be recognized. ( Page 102 When the specific
Q series extension base unit cannot be recognized)
Refer to the troubleshooting for the power supply module. ( Page 101
When the POWER LED of the power supply module turns off)
Correctly install the extension cable.
Execute in the order shown below.
• Replace the extension cable.
• Replace the corresponding extension base unit.
• Replace the base unit at one level before the corresponding extension base
unit.
Action
Refer to the troubleshooting for the power supply module. ( User's Manual
(Hardware Design, Maintenance, and Inspection) for the Q series CPU
module used)
Refer to the troubleshooting for the power supply module. ( Page 101
When the POWER LED of the power supply module turns off)
Correctly mount the connector pin for setting the number of extension base
units.
Correctly install the extension cable.
Execute in the order shown below.
• Replace the extension cable.
• Replace the corresponding Q series extension base unit.
• Replace the base unit at one level before the corresponding Q series
extension base unit.

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