基于STM32分布式I0与ModbusRTU通信系统设计与实现

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中图分类号：TP311 文献标识码：A 文章编号：2096-4706（2026）03-0190-05

Design and Implementation of a Distributed IO and Modbus RTU Communication System Based on STM32

SUYanjuan，WANG Ruixue，XIONGXinguo （HenanPolytechnic，Zhengzhou 45oo46，China）

Abstract：To met therequirement foreficientdata exchangeandremotecontrolamong devices in thefeldof industrial automation，this paperdesignsand implements adistributed IOcontrol system basedonSTM32chip，and integratesModbus RTUindustrialcommunication protocol.In termsof methodology，this studytakes Siemens S7-20oPLCasthe Modbus RTU masterstationandthe development board as the slave station.Itcompletes the designofhardware circuits，the writing of underlying driverprograms and ModbusRTUprotocolcodes.After theprogram iscompiledand writen intothedevelopment board，systemtestingandperformanceoptimizationareconducted.Thetestresultsshowthatthesystemachievesareliable conectionbetweenS7-12oPLCandthedevelopmentboard，andisabletorealizedatatransmisionandcommandcontrol based onModbusRTUprotocol.This research shows goodapplication prospects inthe fieldofindustrial automation， which effectively improves production efficiency and the reliability of data interaction.

Keywords： STM32 Chip; ModbusRTU Protocol; S7-1200 PLC

0 引言

分布式IO控制系统能够将输入输出功能分布到各个现场节点，有效解决了传统集中式控制布线烦琐和存在单点故障隐患的问题，显著增强了系统的适应性与扩展能力[，因而成为应对现场多样化、分散化控制需求的优选方案。（剩余5550字）