基于双核模型的PROFINET IO从站设备设计

Design of PROFINET IO slave device based on dual-core model

为解决分布式I/O设备的串行接口与外部系统进行通信时实时性较差、可靠性较低的问题,设计了一种基于PROFINET实时工业以太网的IO从站设备。提出了一种基于PROFINET通信核芯片和RS485应用核芯片的双核模型方案,其中PROFINET通信核芯片采用专业集成电路芯片,RS485应用核芯片采用STM32微控制器芯片,双核一同完成PROFINET协议与RS485协议之间的转换工作。分析了主站控制器和IO模块通过从站设备进行非循环数据和循环数据交互的流程,设计了从站设备和IO模块的通用站描述文件,通过在从站设备中集成PROFINET网络通信接口和RS485通信接口,搭建了一套完整的PROFINET IO通信测试平台并完成了系统组态,测试结果表明,设计的从站设备实现了从PROFINET协议到RS485协议的跨网通信,为传统分布式I/O设备连接PROFINET工业以太网的技术领域提供了一个可行、可靠的解决方案。

To address the issue of poor real-time performance and low reliability in communication between the serial interface of distributed I/O devices and external systems,a design for an IO station device based on PROFINET realtime industrial Ethernet has been proposed.A dual-core model is presented,utilizing the PROFINET communication core chip and RS485 application core chip.The PROFINET communication core chip is an application-specific integrated circuit(ASIC),while the RS485 application core chip is based on the STM32 microcontroller.The dual-core model collectively handles the conversion between the PROFINET protocol and the RS485 protocol.The process of non-cyclic and cyclic data interaction between the main station controller and IO modules through the IO station device is analyzed.A generic station description(GSD)file for the IO station device and IO modules is designed.By integrating PROFINET network communication interfaces and RS485 communication interfaces into the IO station device,a complete PROFINET IO communication test platform is established,and system configuration is completed.The test results indicate that the designed IO station device achieves cross-network communication from PROFINET to RS485,providing a feasible and reliable solution for connecting traditional distributed I/O devices to the PROFINET industrial Ethernet in the field of technology.