Jay R. Jeffreys, P.E.
Articles
Looks may not be deceiving after all
Maybe I spent too many years working for a PLC vendor, or maybe I'm just skeptical. When it comes to a factory-floor control system, though, I'm more likely to be impressed by reliable, predictable behavior than by fancy screen displays.The people at Wonderware Corp. (Irvine, Calif.) have consistently delivered good graphical user interfaces for the application programmer as well as the e...
Graphical programming for analog control
If it's true that just any old picture is worth a thousand words, then a detailed picture of a regulatory control strategies must be worth quite a few words of machine code, right? That certainly seems to be part of the design intent behind the control system software development package known as Gello, available from RTP Corp.
Structured programming for Quantum PLCs
As a system integrator I suppose I should love relay ladder logic. It lets me write long strings of code with no apparent structure which only I can maintain and extend. There is no greater sense of job security than knowing that clients must call me back in any time something goes wrong with the code.