Siemens PLC MPI are details of how the network communication explanation -

With the progress of science and technology, the development of intelligent chip gradually mature equipment intellectualized degree also increase, then based on open standards between intelligent devices automation control system consisting of the fieldbus technology is gradually mature. So in addition to using Siemens PLC industrial Ethernet and profibus. In our common programming, configuration, communication with the MPI, ASI and other technology. These technical protocol implementation of Siemens PLC communication between host and intelligence from the stand, and even compatible communication protocol conforms to the third party products. Siemens communications roughly MPI network communication, PROFIBUS network communications, industrial Ethernet communication of the three.

Siemens PLC controller of MPI network communication

MPI call interface communication, more commonly used in small scale, small points on-site communication, which can realize the operation of the Siemens PLC panel ( TP / OP) And the data exchange between upper machine, such as Siemens PLCs7 - 200/300/400, and its communication rate of 19. 2Kbit- 12 mbit, can connect up to 32 contact, communication distance is less than 50 m. If the relay connection, the distance between the station of up to 9100 m, but also can only use up to 10 repeater, and it also take up the number of nodes.

MPI network to form: the function in the use of STEP7 configuretion can be assigned to each network node a MPI address and the address, connection is needed in the first node of MPI network and the last node and terminal resistance.

PLC to realize MPI communication, can use three ways to solve. Global packet communications, no configuration connection communication methods, configuration connection communication methods. Global packet communications:

implementation during the process, hardware configuration of PLC configuration requires communication between PLC station sending and receiving area does not need any process, only adapt to s7 - The communication between 300/400. At best, only 15 cpus in a project to build the global data. To achieve global data communication method: global packet communications SMATIC Settings s7 - in the Manage 300/400 mpi address, and then in the options/define global data define the communication data needs to be address. > symbol indicates the data sent, corresponding to the column is to accept data, will eventually set good program downloaded to the PLC MPI communication can be realized.

no configuration connection mode of communication: it is suitable for S7 - Communication between 200/300/400, but not confused with global packet communications. As a two-way communication, communication calls communication blocks on both sides, a communication block used to send data, another communication block used to receive data. In block OB35 interrupt call SFC65 used to send data, called SFC66 used to receive data, then is the programming. Due to receiving block can only identify the data identifier, no matter which CPU to send data to invoke SFC69 to release the connection. No configuration one-way way: only on one side to write programs, such as the access patterns between client and server. As long as the client program can, without the server program. So, the client just call SFC traffic block can access the server.

configuration connection mode of communication: it is suitable for S7 - Or S7-300/400 Communication between 400/400 and S7 - S7-300/400 communications 300 can only be used as a server, S7 - at this time As a client to S7-400 300 to read and write operations. S7- S7-400/400 communications 400 can be used as a server and as a client, its biggest packet length up to 160 bytes. Can realize communication methods: configuration in the project NETPRO set in the S7 network connection, the connection is established in the block when the parameter ID need to pay attention to, it is identified as identification data sending and receiving data address, need to call on the client side programming SFB14, SFB15 system function block, and finally saved compilation download to communication can be realized in the PLC.

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