C407H
Connection Number Setting Error
Mitsubishi Electric · MELSEC iQ-R Module Dedicated Instructions
What does C407H mean?
This error occurs if the fixed buffer send/receive mode (e.g., send) of the specified connection (1 to 16) has an invalid combination with the communication type of the protocol to be executed (e.g., receive only) for the Ethernet module.
Common Causes
- The fixed buffer send/receive mode of connection numbers 1 to 16 is incompatible with the communication type of the protocol being executed (e.g., send mode with receive-only protocol).
Repair Steps & Checklist
Click steps to track your progress.
- 1
Review the fixed buffer send/receive mode settings for Ethernet module connection numbers 1-16 to ensure compatibility with the communication type of the executed protocol.
Verified technical data. Last updated: March 2026
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Source: Mitsubishi Electric MELSEC iQ-R Module Dedicated Instructions