Python-snap7 is a pure Python S7 communication library for interfacing with Siemens S7 PLCs. It supports Python 3.10+ and runs on Windows, Linux, and macOS without any native dependencies. The name ...

And "-55" of course throws the ValueError. When I run the same query with snap7 ( cpp or plain-c ), I get the correct values on windows and linux. Therefore I guess ...

Python does not replace a PLC. It is not a real-time control language and it never will be. But the moment you stop thinking of Python as “another control language” and start thinking of it as the ...