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What causes an Invalid PLC Family / Model / Type Modbus error in a Harmony/Magelis HMI with Vijeo Designer?

Issue
What causes an Invalid PLC Family / Model / Type Modbus error in a Harmony/Magelis HMI with Vijeo Designer?

Product Line
Magelis/ Harmony HMI with Vijeo Designer Runtime

Resolution
The most common cause of this message appearing in the System Log of the HMI is when the Modbus Unit ID of the server device is different than what is defined in the Modbus Driver Equipment in the Vijeo Designer project.

For example: When communication to a BMXNOC Modicon X80 Ethernet communication module, the Unit ID for that module is 1. Since the default in Vijeo Designer is 255, this mismatch will cause the error to appear.

For Modicon PLCs configured with:

Unity Pro / EcoStruxure Control Expert (Modicon Momentum, Quantum, Premium, M340, M580, BMXNOE Ethernet Module), or
SoMachine / EcoStruxure Machine Expert (M221, M258, LMC058, M241, M251, M262),

the Unit ID when the Ethernet port is connected directly to the CPU is 255.

System Error Log in Vijeo Designer Runtime - Invalid PLC Family/Model/Type message

The Unit ID setting for the Modbus equipment is found in the Vijeo Designer project Navigator window under: IO Manager -> Modbus TCPIP01 -> ModbusEquipmentXX node:
Modbus Equipment Node in Vijeo Designer