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I was kind of hoping that Ladder Logic would die a slow death, but it seems there are always engineers that want to keep propagating it. What we really need is a simple real-time script language, with object tags, kind of like this:
valve1.open pid1.setpoint(200) wait_until(temp > 100) burner.send(50) data_aquisition1.start delay(10) data_aquisition1.stop It would be a whole lot easier to teach to scientists or other non programmers. You could even make a web interface that lived on a 7xxx to allow them to enter the scripts, and also set the tagnames of the AI, DI, AO, DO, and the engineering units, alarms, etc. I will have this eventually, but I have too many projects right now. It is actually all there, I just need to port it to the 7xxx and clean up some loose ends. Another interesting programming method is state charts, which I also plan to add to my control engine. Well, as much as we might wish it, ladder logic will NOT go away. Don. On 1/12/07, Yan Seiner <> wrote:
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