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CHANGES

3.1.1

Bug fix release for PLC clock reads.

  • Fix: get_plc_datetime() / parse_get_clock_response() now reads the year from byte offset 2 of the USER_DATA GET_CLK response (previously byte 1, which is a reserved / version marker on S7-300, S7-400, S7-1200 and S7-1500 CPUs). The old offset decoded garbage month values on every real PLC, which then fell through to a silent fallback.
  • Fix: Remove the silent datetime.now() fallback from the clock parser. When the response is truncated, the PLC replies with an error code (e.g. 0xd402 "Information function unavailable"), or BCD decoding fails, the parser now raises ValueError with diagnostic detail. Callers that previously trusted the returned datetime could not distinguish a real clock read from fabricated host time.
  • The parser probes year offsets 2 and 1 and accepts the first that yields a plausible year in 1990..2099, so firmware variants that omit the version-marker byte still work.

3.1.0

  • Feature: redundant PLC support for S7-300H/400H/1500R/H (automatic failover between primary and standby CPUs with heartbeat monitoring).
  • Parallel dispatch for multi-PLC polling.

3.0.0

Major release: python-snap7 is now a pure Python S7 communication library.

  • Breaking: The C snap7 library is no longer required or used
  • Complete rewrite of the S7 protocol stack in pure Python
  • Native Python implementation of TPKT (RFC 1006) and COTP (ISO 8073) layers
  • Native S7 protocol PDU encoding/decoding
  • Pure Python server implementation for testing and simulation
  • No platform-specific binary dependencies
  • Improved error handling and connection management
  • Full type annotations with mypy strict mode
  • CLI interface for running an S7 server emulator (pip install "python-snap7[cli]")

If you experience issues with 3.0, pin to the last pre-3.0 release:

$ pip install "python-snap7<3"

1.2

New Contributors

Full Changelog: https://github.com/gijzelaerr/python-snap7/compare/1.1...1.2

1.1

  • Make a binary wheel for all platforms (#232)
  • Improve doc strings of all functions (#242)

Special thanks for this release to

  • Fabian Beitler
  • Nikteliy
  • Lautaro Nahuel Dapino

1.0

  • Drop python 2 support (#214)
  • Feature request: ReadSZL() (#196)
  • Keep argument format across the functions (#193)
  • Drop Python2 Tests (#167)
  • Support for S5TIME (#163)
  • Add type annotations (#157)
  • client.full_upload() return bytearray size 65536 (#127)
  • Some client tests segfault on Linux (#26)
  • Not all functions are implemented yet (#25)

special thanks to Fabian Beitler and Nikteliy for their contributions to the 1.0 release!

0.11

  • Update read_multi.py (#132)
  • Added fixes to snap7/client.py read_area function to allow for Counter and Timer Reads (#121)
  • Post to a public docker repository? (#119)
  • Implementation of Cli_SetDateTime, Cli_GetDateTime enhancement (#114)

0.10

  • Fix OSX travis build #99
  • util.get_int() broken #101
  • Compatibility issue with Python3 #109
  • Logo 8 improvements bug #105

0.7

  • util.get_int() broken (#65, #71)
  • fix Add files via upload bug (#59)

Special thanks to Pelle van der Heide for solving issues

0.6

  • Add del to client, server and partner (#69)
  • Add files via upload (#59)

Special thanks to xybsoft for solving issues

0.5

  • adding some missing functions
  • fixing Python3 support (issue #43)
  • improving the documentation

0.4

More functions added:

  • client.plc_stop
  • client.plc_cold_start
  • client.plc_hot_start
  • client.read_multi_vars

0.2.1

Small fix, README.rst was not included in sdist

0.2

  • Add support for Windows
  • Add functions added in Snap7 1.1.0
  • Add missing client functions
  • fix some partner functions
  • simplified API

0.1

  • Initial release.