I have an SPC software package to which we are storing keyed and gaged(via RS-232) data. We wish to expand the system by taking analog sensor data from PLC's on the floor. The SPC software manufacturer provides a DLL library to which calls can be made to drive the data into the data tables. I am told that code (VB, C, etc.?) can be embedded within another application to make the DLL calls. Has anyone already crossed this bridge? I don't think it would be prudent to write individual code for multiple PLC manufacturers. I'm trying to see if a third party HMI w/ scripting capability could allow me to access multiple e-net connected PLC's and, upon a time interval or event, make the DLL call to store the appropriate data. Any suggestions?