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In Ignition, from the left hand menu bar, select Config > OPC UA > Device Connections > Create new Device... and select the “Modbus TCP” driver from the list of protocols:

This will display the Modbus TCP configuration page. Setup the configuration as shown below:

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Once you save the configuration for the Modbus TCP connection and everything is setup properly on the MGate you should see the “Status” of the connection change to “Connected”. 

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Configuring Modbus Registers to Use Modbus TCP with Modbus RTU Unit Addresses

As pointed out above, when you start to configure Ignition tags that want Modbus register information from any of the Modbus RTU devices connected to the MGate unit, you will need to specify the Modbus Address in the OPC tag path. There are three (3) CLICK PLCs on the RS-485 2-wire serial network connected to the MGate. The Modbus register values are in the Ignition folders CLICK 01, CLICK 02, and CLICK 03.