What is the difference between MPI and PROFIBUS-DP? -Solutions - Huaqiang Electronic Network

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What they have in common is that both MPI and DP are based on the RS485 interface.
Various features:
MPI (Multipointinterface) is the interface of SIMATICS7 multi-point communication. It is a network suitable for communication between a few sites. It is mostly used for short-range communication between a host computer and a small number of plcs. The communication rate of MPI is 19.2K~12Mbit/s. There can be up to 32 stations on the MPI network, and the longest communication distance of one network segment is 50 meters (communication baud rate is 187.5Kbit/s), longer communication. The distance can be extended by an RS-485 repeater. MPI allows master-master communication and master-slave communication.
PROFIBUS-DP allows the construction of a single master or multi-master system. Up to 126 sites can be connected on the same bus. The description of the system configuration includes: number of stations, station address, input/output address, input/output data format, diagnostic information format, and bus parameters used. Each PROFIBUS-DP system can include the following three different types of equipment: 1 primary DP master (DPM1): the primary DP master is the central controller, which is associated with the dispersed stations (such as DP slaves) within a predetermined information period. Station) exchange information. A typical DPM1 is a PLC or PC. 2 Level 2 DP master station (DPM2): The level 2 DP master station is a programmer, configuration device or operation panel, which is used during DP system configuration operation to complete system operation and monitoring purposes. 3DP slave: A DP slave is a peripheral device (I/O device, driver, hmi, valve, etc.) that performs input and output information acquisition and transmission. 4 single master system: In the operational phase of the bus system, there is only one active master.