python-snap7

python-snap7 is a pure Python S7 communication library for Siemens PLCs, implementing the full protocol stack (TPKT, COTP, S7) in Python. As of version 3.0.0, it no longer requires the underlying Snap7 C library. It provides an interface for connecting to and interacting with Siemens S7-300, S7-400, S7-1200, and S7-1500 PLCs. The library is actively maintained with a moderate release cadence, with major versions introducing significant architectural changes.