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  • There is a new web service interface, called iHistory, that is introduced for Wonderware Historian 2014 R2. This is based on several industry standards and includes extensions that will be familiar to many Wonderware Historian users. Though the initial interface exposes different kinds of data from on-premise Historian (alarm & event history) and Wonderware Online (process history).


  • There are two parts to the OData interface, Alarm/Event history and Process History. The first part was released and fully supported in 2014 R2, but the second was not—it was mostly there, but not very scalable or fully tested until the patch.