Our company is looking to move our proprietary Data Logging & Data Aquisition system over to PI. Most of our customers already have PI systems installed. All of our systems use Allen Bradley ControlLogix PLCs. It is going to be difficult to complete our development work without being able to access PLC values from a test system. I don't think the built-in sine waves, ramps, etc. are going to work for us. Is their anyway to get an interface for an Allen Bradley Controllogix & RSLinx for development? We have joined the PI development club, but apparently an OPC DA interface is not available with that. Is it possible to just purchase one for development purposes?