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Old December 7th, 2017, 04:44 PM   #8
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Join Date: Jun 2012
Location: Australia
Posts: 2,693
I've seen the same thing on a freezer we had to integrate to a production line. The PLC in question didn't even handle the refrigeration section - that was done by another PLC. All it controls was the conveyor belt, the evaporators, and the temperature sensors.

The program has 3 tasks, 32 programs, 270 routines, 42 AOI's (the vast majority of which are used only once, defeating the purpose of an AOI), 318 AFI's, and generates around 70 minor faults per second.

We recently discovered a bug in the program where if you don't select a new recipe, after around 1 year of running the PLC will fault.

It's a f***ing freezer. Not a nuclear reactor.
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