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.
Ř The three objects can be used simultaneously in the same application.
Ř Many objects of the same type can be instanced simultaneously.
Ř Many applications can use Snap7 simultaneously.