s7commplus

Pure-Python S7CommPlus communication for Siemens S7-1200 and S7-1500 PLCs. It supports S7CommPlus V1, V2 (TLS), and V3; synchronous and asyncio clients; and a server emulator for testing.

pip install s7commplus

from s7commplus import Client

with Client() as client:
    client.connect("192.168.1.10", 0, 1)
    data = client.db_read(1, 0, 4)

S7CommPlus is used by newer S7-1200/1500 PLCs when classic PUT/GET access is disabled. This is an unofficial implementation and is not affiliated with, endorsed by, or supported by Siemens AG. Test against an isolated controller before using it in production or safety-relevant environments.

python -m pip install -e '.[test]'
pytest
ruff check s7commplus tests
ruff format --check s7commplus tests

The session-authentication implementation derives from HarpoS7; its MIT license is included at s7commplus/session_auth/LICENSE-HarpoS7.