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The first step is to configure the tag provider in Ignition in a way that MQTT Transmission understands.  Start by configuring your OPC server, client, and tags.  This can be done using the Inductive Automation documentation here.  Once this is done, the Tag Provider needs to be set up in Ignition via the Ignition Designer.  Using a Web Browser, browse to the Ignition Gateway on your Ignition Gateway.  If it is running on your development machine, that is: http://localhost:8088.  You should see this:

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In this example we're going to use the '"default' " tag provider within Ignition Enterprise.  Do so by expanding Expand 'All Providers' in the Tag Browser and select 'default'.  Note that if Ignition Edge is being used, the tag provider will be named 'edge'.

With 'default' (or 'edge') selected, click the 'OPC' icon in the Tag Browser icon list:

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Make sure the "Block Node Commands" and "Block Device Commands" settings are disabled, as shown below.

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With this enabled and Designer in read/write and preview mode, you can write to the outputs of the modbus device from the Tag Browser:

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