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Test-driven development in the PLC world


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Hello,

I'm a software engineer and I had an interesting discussion with a friend of mine who is doing PLC type of work. I was very surprised to learn that there are, apparently, no frameworks to do test-driven development. I'm not a PLC guy but the way I see it software for PLC is nothing more than something which takes an input in the form of an electrical signal and then ouputs a certain electrical current (0s or 1s) which makes it perfectly susceptible to test-driven development. Is it actually possible to do this in unitronics or via some sort of 3rd party framework/tool?

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