Getting PLC data to management


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I wanted to discuss emerging trends in connecting PLCS to enterprise systems for reporting with specific emphasis on bidirectional data transfer between standard SQL databases. The secondary focus is working with other existing standards such as SAP.

I use FactorySQL to make an SQL database into an open "tag database" to synchronize PLC tags and trigger data in and out.

Please comment on your levels of success and flexibility on other packages. I'm specifically interested in how the following companies do it:
Wonderware, Rockwell, GE, and Citect