What does WRITE_REG error 6007 indicate when used in a Quantum over Ethernet TCPIP.

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This means that the NOE module slot mapping register is set incorrectly.

The ADDRFLD pin is an Array of 5 words. The high byte of the first word is the physical slot position in HEX of the Ethernet module. The low byte is the Modbus mapping index if going through a bridge. A setting or 0500 HEX would mean that the NOE that the message is going out on resides in slot 5 and no index is needed for the client device.
The remaining 4 words are the IP address of the server device.
Note: If using the embedded port of a Unity Quantum the high byte of the first word should be FE