When The Specific Extension Base Unit Cannot Be Recognized; When The Specific Q Series Extension Base Unit Cannot Be Recognized; When An Error Has Occurred In An Extension Base Unit For A Redundant System; When Data Cannot Be Written To The Programmable Controller - Mitsubishi Electric MELSEC iQ-R Series User Manual

34.4
When the Specific Extension Base Unit Cannot Be
Recognized
For troubleshooting, refer to the following:
 MELSEC iQ-R Module Configuration Manual
34.5
When the Specific Q Series Extension Base Unit
Cannot Be Recognized
For troubleshooting, refer to the following:
 MELSEC iQ-R Module Configuration Manual
34.6
When an Error Has Occurred in an Extension Base
Unit for a Redundant System
For troubleshooting, refer to the following:
 MELSEC iQ-R Module Configuration Manual
34.7
When Data Cannot Be Written to the
Programmable Controller
Check the following:
Check item
Check if password is not registered.
Check if the SD memory card is write-protected while the SD memory card is
being targeted for writing.
When the target of the write is an SD memory card, check that the SD
memory card has been formatted.
Check if the data to be written exceeds the capacity of CPU built-in memory or
SD memory card.
If data cannot be written to the programmable controller 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.
34.8
When Data Cannot Be Read from the
Programmable Controller
Check the following:
Check item
Check if password is not registered.
Check if the target memory to be read is correctly specified.
Check if program restoration information has not been written.
If data cannot be read from the programmable controller 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.
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34.4 When the Specific Extension Base Unit Cannot Be Recognized

Action
Authenticate a password using the engineering tool.
Clear the write-protect for the SD memory card.
Carry out formatting for the SD memory card.
Check the CPU built-in memory or SD memory card for their free space.
Action
Authenticate a password using the engineering tool.
Check the read target memory (CPU built-in memory, SD memory card, or
intelligent function module).
When program restoration information has not been written, data cannot be
read from the programmable controller. When writing data to the
programmable controller, write program restoration information.