Currently I am having PI Data Server 2010 installed in my system.
If I want to install and use PI AF Server in that same machine, do I have to purchase a separate license for that?
Or I can directly use it.
Beginning with PI Server 2010, it includes PI Data Archive and PI AF among other things. Therefore, if you are licensed for PI Server 2010 or higher, you can install both Data Archive and AF without the need to purchase another license.
Having said that, be aware that we do not recommend installing Data Archive and AF on the same computer as they may compete for hardware resources.
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