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jpbledsoe
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Re: Part II: Control System Feedback Loops
jpbledsoe   3/1/2012 9:23:41 PM
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Thanks. Brings back some memories of working in chemical process control in the 70's.

At that time and that company, there was a mixture of relay logic, NorPak (Allen Bradley?), and Digital Equipment PDP-8 and PDP-11 controllers. I remember helping an engineer program in a language known as Boole, where ladder diagram segments were the printed output documentation (to help electricians troubleshoot the systems) for the boolean statements we were writing.



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