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Once the configuration steps have been completed, the resulting network topology is shown below:




Configuring the Ignition Modbus TCP Driver

Now that the MGate unit is setup and providing a Modbus TCP to Modbus RTU RS-485 multi-drop serial network, we’ll proceed to setting up the Modbus TCP driver in Ignition to take advantage of this network. 

Note
It might not be completely evident when setting up a network like this that we will only setup a single Modbus TCP Device Connection to talk to all three (3) of the Modbus RTU slave devices connected to the MGate.


In Ignition go the Config/OPC UA/Device Connections and select the “Modbus TCP” driver from the list of protocols:


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