Client-Server Communications between WinAC Basis and S7-200 Stations via S7 Communication (PUT/GET)
On the one hand a SIMATIC PC station should easily and cost efficiently tranfer small to medium sized parameter data to multiple small PLCs. Vice versa it should centrally collect process data from those PLCs.
The S7 communication is a uniform protocol within the entire SIMATIC family used to exchange data between automation systems via simple user interfaces. This application provides the user with a quick, practical introduction to become familiar with the client/server specifics of the S7 communications service PUT/GET and shows how to use the configuration and the user interface in the SIMATIC CPUs. The example specifically illustrates how a PC station with SIMATIC WinAC Basis can send data records with a size of approximately 100 bytes upon request of an S7-200 substation to this S7-200 substation via the MPI bus. In this process, the PC station is the active client, the S7-200 station the passive server.
The following picture illustrates the hardware configuration of this example.
The program shows a solution how to code the active side (WinAC Basis, client) in such a way that it is possible to process requests from the passive bit interface of the S7-200 CPU (server).
This principle is illustrated in the following scheme.
S7 Protocol, Bilaterally configured connection, Unilaterally configured connection, S7 connection, WinLC, WinAC, Fixed connection, PUT, GET, CPU 222
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