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[4]: great stuff
by JonathanBThompson on Mon 9th Oct 2006 18:05 UTC in reply to "RE[3]: great stuff"
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Certainly PLC's are used, and certainly there's a microcontroller in them: but they're also certainly not running anything more than a very simple embedded bit of software in a very tight loop.

Yes, PLC's simplify things immensely, and can often make things much cheaper once things start getting complicated and allow things to be reprogrammed as needed, but they don't require even anything as complicated as QNX, or as much RAM: they've been around and used before QNX was around, in such places as car factories. PLC's have a minimum amount of memory, only as much as is required to hold the current state of all the I/O hardware and the limited number of timers and such, because they don't need anymore than that.

Put in the original context of "I wouldn't use an elevator with anything else" even with the more sophisticated elevators (how many use QNX?) causes options to be extremely limited.

FYI, yes, I've programmed PLC's in industry.

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