I have written several times over the years about a project on Source Forge to do a Linux PLC. Originally a bunch of anti-Microsoft rebels, they completed an implementation that includes IEC 61131-3 programming. Originally Sixnet offered an RTU/PLC that would serve as a target for the Linux software. Now I just found out that Wago also offers a Linux PLC. So, if you want to run an alternative system, you have options.

Check out:

From March 2006

December 2009

and a comment from March 2011

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