A multi-unit communication test system based on fpga

Abstract

The invention discloses a multi-unit communication test system realized based on FPGA, which includes a resource board, a PLC module and a host computer. The resource board includes FPGA circuit, drive circuit, Ethernet module, AC bus simulation circuit, DC power supply circuit, clock circuit and reset circuit; PLC module includes 20 client subunits PLC1‑PLC20, each client subunit is equipped with a working Display light LED1-LED20 and switch S1-S20, and a server subunit PLC21; the client subunit, work display light and server subunit of the PLC module are connected to the drive circuit of the resource board, and the drive circuit, clock circuit and reset circuit are connected to the FPGA circuit, the FPGA circuit is connected to the Ethernet module. The present invention has the advantages of a large number of serial ports, fast communication speed, high test efficiency and real-time programming control by the upper computer. It realizes the communication between each PLC unit and the upper computer and the PLC unit based on the FPGA chip, and realizes the maximum simulation The purpose of testing the desired communication environment.

Description

technical field [0001] The invention belongs to the technical field of network communication, and in particular relates to a structure and a method for performing data communication between various PLC units and between a host computer and a PLC unit through an FPGA chip. Background technique [0002] High-speed rail technology is a rapidly developing emerging industry. To ensure its safe and reliable operation, good data exchange communication is inseparable. Generally speaking, it is unrealistic to conduct communication tests directly on high-speed rail, and the cost is high. It is necessary to simulate the environment of high-speed rail communication through certain technical means to test the status and reliability of communication. With the development of science and technology, especially communication technology and network transmission technology, it is possible to simulate the communication of multiple carriages of high-speed rail. [0003] The traditional communic...

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Problems solved by technology

[0004] The object of the present invention is to solve the simulation test problem of high-speed rail communication, by above-mentioned analysis, the microcomputer with CPU structure such as single-chip microcomputer has various defects, can not undertake this task well, in view of this, the present invention provides a kind of realization based on FPGA The multi-unit communication test system adopts the FPGA that can be executed in parallel instead of the single-chip microcomputer as the main control chip of the communication circuit to solve the problem of insufficient number of serial ports and insufficient communication speed. At the same time, the FPGA can be programmed and controlled by the host computer, which improves the flexibility of the system. and adaptability, human-computer interaction is also enhanced

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