基于单片的微型LC的研究深刻研究设计书158529616.docVIP

本科毕业设计（论文） 基于单片机的微型PLC的研究 摘 要 可编程逻辑控制器（PLC），是一种为工业控制特别设计的专用计算机。因为它易于设计和编程，运行可预估，甚至在恶劣的环境下还可以保持正常的工作，所以广泛运用于工业控制。 本课题在分析主流PLC的体系结构、工作原理的基础上，设计了一个基于单片机的微型PLC，目的是在小型控制系统中能够代替小型PLC，实现更加灵活的应用方案并在保证可靠性的基础上大大降低成本。 本课题设计的系统在硬件设计上参照PLC的体系结构，在单片机的基础上扩展了丰富的外围设备，实现了PLC的大部分功能模块，包括中央处理器（CPU）、电源模块、振荡电路、复位电路、数字量I/O、串口通信等，并设计了专门的输入输出点处理电路，使系统具有良好的抗干扰特性和驱动能力。软件设计上分为实验部分和实际运用部分。实验部分是用C语言与汇编语言编写的，测试了PLC控制板的可行性。实际运用部分为了使编程简单通过GX Developer编程软件编写梯形图，再通过PMW-HEX转换软件将其转换为单片机语言，再通过STC_ISP软件将其下载到基于STC90C52单片机的微型PLC控制板上。 基于单片机的微型PLC的设计，提供了更灵活的软、硬件方案，并大大降低了控制系统的成本，具有较高的实用价值。 关键词 微型PLC，单片机，GX Developer，PMW-HEX，STC90C52 ABSTRACT Programmable logic controller (PLC), is a special-purpose computer for industrial control design.Because it is easy to design and programming, running can be estimated, even in the worst of circumstances can also maintain normal working, so widely used in industrial control. Analysis of this issue in the mainstream of PLC system structure, working principle and on the basis of common instructions, design based on single-chip micro-PLC, is aimed at small to replace small PLC in the control system, for more flexible application on the basis of the programme and in ensuring the reliability of significantly reducing costs. This topics design of system in hardware design Shang reference PLC of system structure, in single tablets machine of Foundation Shang extended has rich of perimeter device, implementation has PLC of most function module, including central processing unit (CPU), and power module, and oscillation circuit, and reset circuit, and digital volume I/O, and serial communications,, and design has specifically of entered output points processing circuit, makes system has good of anti-interference characteristics and drive ability.Micro-PLC based on single-chip design, providing a more flexible software and hardware solutions, and dramatically