====Running Multiple Model Processes====

If you are going to run several //different// Python models in different processes (for example, you might have different modelling teams working on different areas of your plant), you will need to take some extra steps during setup.

===Run Each Model From A Different Folder===
ModelHost creates some additional files when you run the model. If you try to run several different ModelHost instances in one folder, these files will be overwritten, which might cause difficulties accessing your OPC-UA information.

For this reason, you should always make sure that each Python model file is contained in a separate folder.

===Avoid OPC-UA Port Number Collisions===
ModelHost starts an OPC-UA server on a port. This defaults to **7332**, but when you are running several Python models on the same server, you'll need to ensure that each runs on its own port number.

This us done by setting the **uaport** property of the ModelHost object, before you call **Run()**

<code>
host = ardimodel.ModelHost()
host.ardiurl = "localhost"
host.ardisite = "default"
host.uaport = 1255
</code>