The Snap7 theatre (剧场、讲堂)
The purpose of Snap7 is to fully integrate your PC station into a PLC network, without anybody sees the difference.
To allow this, the Snap7 theater must be the same as the Siemens and contain the same actors.
Snap7 library contains three objects: the Client, the Server and the Partner.
Ø The three objects can be used simultaneously（同时） in the same application.
Ø Many objects of the same type can be instanced simultaneously.（可以同时实例化许多相同类型的对象。）
Ø Many applications can use Snap7 simultaneously.
Snap7 Client
A PLC client is the most well-known object, almost all PLC communication drivers on the market are clients.
Snap7 Server
Introd
