Backboard bus master station, system and data communication method thereof

Abstract

A backplane bus master station, a system and a data communication method thereof are disclosed. The backplane bus master station comprises a physical transceiver and an application layer unit realizedthrough a CPU core, and also comprises a data link layer unit, a shared buffer area and a polling control information buffer area realized through an FPGA, the application layer unit receives and analyzes a configuration parameter set, and the configuration parameter set comprises periodic polling data and configuration data, stores the parsed periodic polling data and configuration data into thepolling control information buffer area, reads a polling access result in the shared buffer area and sends the polling access result to a control unit; the data link layer unit reads periodic pollingdata and configuration data of the polling control information buffer area, sends the configuration data to a slave station, performs polling control on the slave station according to the periodic polling data, receives a polling access result of the slave station and stores the polling access result in the shared buffer area; and the physical transceiver realizes physical transceiving of data. According to the invention, the communication rate of the backboard bus is improved, and the wiring of a PLC backboard is simplified.

Description

technical field [0001] The present application relates to but not limited to the field of backplane bus technology, and in particular relates to a backplane bus master station, a system and a data communication method thereof. Background technique [0002] Programmable Logic Controller (PLC) is a digital computing operation electronic system specially designed for application in industrial environments. It uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production through digital or analog input and output. process. [0003] The PLC backplane bus is mainly responsible for the data exchange between the main control module and other sub-modules (signal modules, functional modules, etc.) on the rack, and usually also includes the power supply for the sub-modules. PLC systems usually use traditional serial communication technolo...

AI Technical Summary

Problems solved by technology

PLC systems usually use traditional serial communication technology to implement the backplane bus. Serial bus can improve the reliability of automation equipment in harsh factory and industrial environments. Traditional serial communication technology includes controller area network (Controller Area Network, CAN), I2C (Inter-Integrated Circuit), Universal Asynchronous Receiver/Transmitter (UART), Serial Peripheral Interface (Serial Peripheral Interface, SPI) and industrial real-time Ethern

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