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主要内容：

Overview

Snap7 is an open source multi-platform Ethernet communication suite for interfacing

natively with Siemens S7 PLCs. The new CPUs 1200/1500 and SINAMICS Drives are

also partially supported.

Although it has been designed to overcome the limitations of OPC servers when

transferring large amounts of high speed data in industrial facilities, it scales well

down to small Linux based arm boards such as Raspberry PI, BeagleBone Black,

pcDuino and CubieBoard.

Three specialized components, Client, Server and Partner, allow you to definitively

integrate your PC based systems into a PLC automation chain.

Main features

 Native multi-architecture design (32/64 bit).

 Platform independent, currently are supported Windows (from NT 4.0 up to

Windows 8), Linux, BSD, Oracle Solaris 11.

 Fully scalable, starting from blade servers down to Raspberry PI board.

 No dependence on any third-party libraries, no installation needed, zero

configuration.

 Three different native thread models for performance optimization:

Win32 threads/ Posix threads / Solaris 11 threads.

 Two data transfer models: classic synchronous and asynchronous.

 Two data flow models: polling and unsolicited (PLC transfers data when it wants

to).

Additional benefits

 Very easy to use, a full working server example is not bigger than the “Hello

world”.

 Hi level object oriented wrappers are provided, currently C/C++, .NET/Mono,

Pascal, LabVIEW, with many source code examples.

 Multi-platform rich demos are provided.

 Many projects/makefiles are ready to run to easily rebuild Snap7 in any platform

without the need of be a C++ guru.

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Licensing

Snap7 is distributed as a binary shared library with full source code under GNU

Library or Lesser General Public License version 3.0 (LGPLv3).

Basically this means that you can distribute your commercial software linked with

Snap7 without the requirement to distribute the source code of your application and

without the requirement that your application be itself distributed under LGPL. A small

mention is however appreciated if you include it in your applications.

Disclaimer of Warranty

THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY

APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT

HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT

WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF

THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU

ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

IF ANYONE BELIEVES THAT, WITH SNAP7 PROJECT HAVE BEEN VIOLATED SOME

COPYRIGHTS, PLEASE EMAIL US, AND ALL THE NECESSARY CHANGES WILL BE MADE.

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Acnowledgments

A special thanks to Thomas W, without his S7comm wireshark plugin, this project

would never have been born.

I also want to thank Thomas Hergenhahn for his libnodave.

Snap7 is not derived from it, but I happily used this library for a long time before

writing my own library.