Linked by Eugenia Loli on Mon 9th Oct 2006 01:31 UTC
QNX Most people haven't heard of QNX Software, though they've likely come in contact with it. The real-time operating system is used where software failure can lead to catastrophic consequences, even death - from high-speed trains to air traffic control towers to highway toll systems. It's also used in more than 100 different types of cars on the road.
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RE[3]: great stuff
by monkeyhead on Mon 9th Oct 2006 15:22 UTC in reply to "RE: great stuff"
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I can't imagine an elavator in a large building that didn't use a microcontroller or PLC.

How do you get your electromechanically controlled elevator to look at 10 requests from 10 different floors for up or down direction and schedule them appropriately with hardwired relays?

I'm sure it's possible with lots and lots of boolean simplification and cabinets full of hundreds of relays, but each relay is a mechanical failure point, and the project would be ridiculously expensive. I can buy 3 or 4 relays for the same price as a cheap PLC that can emulate thousands of relays.

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