Back End server requirements for Edge nodes using MQTT

Ignition
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Hello, I have a question regarding how many ignition back-end servers are required for a large project.

We are intending to have our RTU/PLC's connect to a number Ignition Edge Panel nodes, which in turn are connected to the Ignition Back-End server(s) for use by the system as a whole. Additionally we plan to use MQTT for both the connection from the live data sources to the edge, as well as the Ignition Edge to Ignition back end server.

I see where there is a recommendation to limit each Back-end server to 200 devices and or 250,000 tags and want to determine how many back end servers will be required.

Since we are using the Edge nodes, i assume the number of connections to the back end server will be one for each edge node, as opposed to each downstream live data source, is that correct?

And if we are using MQTT, does each tag from the live data source count as an individual tag as far as the back end server is concerned?

Thank you in advance for any insight you can provide!

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Out of the box, Edge just supports MQTT publishing, not general subscription. The point of Edge is to make local, native protocol connections to then send out via MQTT. PLCs that can do MQTT themselves should be connected directly to a broker for the central system to reach.

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