Based on Siemens PLC parsing - five methods of communication

See the figure, you can see the basic communication position 1

a

PPI, PPI communication protocol is S7 - 200 CPU is the most basic way of communication, through the original port ( PORT0 or PORT1) Can realize the communication, is S7 - 200 CPU communication mode by default.

2 2, RS485 serial port communication

most of the third party equipment support, Siemens S7 PLC controller can choose free port communication mode control through a serial port communication. The simplest case is used only to send instructions ( XMT) Send information to third party equipment such as printers or frequency converter. No matter any situation, must through the S7 PLC program implementation.

when selecting a free port mode, users can send instructions ( XMT) And receiving instructions ( RCV） , send interrupt, receiving interrupt to control the operation of the communication port.

3 three, MPI communication

MPI communication is a relatively simple way of communication, the rate of MPI network communication is 19. 2 kbit/s ~ 12 mbit/s, 32 nodes connected by MPI network up to support the maximum communication distance of 50 m. Communication distance, also can be extended by relay communication distance, but the repeater also occupy a node.

MPI network nodes usually can hang S7 - 200, man-machine interface, programmable devices, intelligent ET200S, RS485 repeater network components, etc.

MPI communication between Siemens PLC controller and PLC controller in general there are three kinds of communication mode:

1, global packet communication way 2, no configuration connection

3, configuration connection 4

4

Ethernet, Ethernet communication core idea is to use a Shared public transport channel, the idea from xiamen university will as early as 1968. In 1972, he and David Boggs ( Both are famous network specialist) Set up a set of network, the network connect different ALTO computer together, also has a connection EARS laser printers. This is the world's first personal computer LAN, the network in the first run on May 22, 1973. He wrote a memo, on first run day memo mean the network name to Ethernet ( 以太网) , its inspiration from the 'electromagnetic radiation can be spread by glowing ether' this idea. In 1979, DEC, Intel and Xerox will jointly network standardization.

in 1984, the fine cable Ethernet products, then have a thick cable, twisted pair, CATV coaxial cable, optical cable and a variety of media mix Ethernet products. Ethernet is currently one of the most popular topology standard in the world, has a high transmission rate, network resources, system function is strong, simple installation and maintenance is convenient wait for a lot of advantages.

5, 5 PROFIBUS - DP communication

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