Again, the software function the OP wanted was for instrumentation system design, not integration (which is what LabVIEW does).
I've used AutoCAD Electrical, and it's okay for some things - it seems especially good for machine control with ladder diagrams, and I do like some of the integrated database functions, e.g., for producing BOMs. AutoDesk also sells AutoCAD P&ID, but I haven't tried it yet, and I don't know if they integrate with each other well.
I typically use the same programs roydm does, and for the same functions. By the way, it's my understanding that SmartPlant Instrumentation is what InTools is now called.
xnuke
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