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AF SDK vs PI Web API for specific application

Question asked by jmoretti on May 16, 2018
Latest reply on Jun 4, 2018 by jmoretti

Hello,

 

I am writing a manual-entry application that will need allow inputs from the users on tank measurements, read existing tank measurement data from corresponding tank elements and tank strapping tables from AF, perform some calculations, and write the inputs and results of the calculations to PI Points (through the AF elements/attributes).  There will also be Event Frame creation to represent material transfers between the tanks.  I am familiar and comfortable with both PI Web API and PI AF SDK and have browsed PI Square on comparisons between using the two technologies.  Some of my requirements favor PI Web API, others favor AF SDK, and was hoping to get advice from the pros on which is more appropriate for my specific application.  Here are my requirements and architecture...

 

1. I have chosen to write the application as an ASP.NET MVC application.  It will run on IIS on a server that is currently hosting PI Vision.  It seems PI Web API and AF SDK are prerequisites for Vision so both are installed on the same server.

2. The users will typically use a web browser on a Windows PC on the same network as the PI system to enter this data, however, they do want the capability to access this web page on a mobile device that is OS-agnostic.

3. Not very many users will be allowed to use this application so I am OK with authorizing at the application layer.

4. The calculations in question don't involve much PI data.  For example, they need to input the current level of the tank, and I need to use predetermined tank strapping data (which will reside in a linked AF table) to calculate the volume, difference in volume from the last entry and current entry, and other similar calculations.

5. Calculations will be done in the application as opposed to PI Analysis Service since I need to have control over the historized timestamp of the calculations.

 

Thanks in advance!

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