What is the PPI protocol - Solutions - Huaqiang Electronic Network

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Both PPI and MPI are Siemens internal protocols. PPI is not disclosed. MPI and PROFIBUS are seven-layer network structure models based on OSI (Open Systems Interconnection). They conform to the PROFIBUS standard defined by the European standard EN50170, a token-based network. letter of agreement. These protocols are asynchronous (serial) character-based communication protocols, and the character format includes a start bit, 8 data bits, an even parity bit, and a stop bit. Its communication frame includes specific start and end characters, source and destination station addresses, frame length, and data checksum. The PPI protocol is a communication protocol developed specifically for the S7-200. The communication port (Port0, Port1) of the S7-200 CPU supports the PPI communication protocol, and some communication modules of the S7-200 also support the PPI protocol. Micro/WIN programming communication with the CPU also passes the PPI protocol. MPI (Multipoint interface) is the interface of SIMATIC S7 multi-point communication. It is a network suitable for communication between a few sites. It is used to connect short-range communication between the host computer and a small number of plcs. The MPI communication rate is 19.2K to 12Mbit/s, but the maximum rate of the MPI network directly connected to the S7-200 CPU communication port is usually 187.5Kbit/s (subject to the maximum communication rate of the S7-200CPU). There can be up to 32 stations on the MPI network, and the longest communication distance of one network segment is 50 meters (when the communication baud rate is 187.5Kbit/s), and the longer communication distance can be extended by the RS-485 repeater. MPI allows master-master communication and master-slave communication, and the number of connections per S7-200 CPU communication port is four. The MPI protocol cannot communicate with an S7-200 CPU as a PPI master. That is, the S7-300 or S7-400 must communicate with the S7-200 to ensure that the S7-200 CPU can no longer be a PPI master. Micro/WIN cannot pass the MPI. The protocol accesses the S7-200 CPU as the PPI master. The S7-200 CPU can only be used as an MPI slave. That is, the S7-200 CPU cannot communicate with each other through the MPI network, and can only communicate with each other through the PPI.