Mitsubishi Electric · MELSEC iQ-R Module Dedicated Instructions
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.
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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.