Rockwell Automation FactoryTalk Historian Classic User Guide - Manual (Page 131)

Creating RSBizWare Custom Analysis Tools Chapter 7
you can register multiple custom analysis tool DLLs with a
Configuration Console. Each custom analysis tool will show up
under the Analysis Tool list associated with each reporting tag
selected for use within a reporting object.
To create a custom analysis tool, you need to implement a single
COM interface published by Rockwell Automation:
RSBizWare::
IRSBizWareCalculator.
What this really means is
that you have to write a single function in the development tool of
your choice that can take a set of data as input and return a
calculated set of data as output. The
RSBizWare::IRSBizWareCalculator
interface expects you to
implement one method called
Calculate()
.
Rockwell Automation Publication HIST-UM001K-EN-E-June 2014 131