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https://sourceforge.net/p/plcemu/wiki/Home/
https://linux.softpedia.com/get/System/Emulators/awlsim-96563.shtml#sgal_0
https://github.com/Vignesh2208/PLCNet
https://pypi.org/project/SimPyLC/
https://www.openplcproject.com/plcopen-editor/