基于ADuC7061的高精度PLC模拟前端设计  

Design of high-precision PLC analog front-end based on ADuC7061

作　　者：徐子毅[1] 胡晓娅[1] 汪秉文[1] 

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《电子设计工程》2013年第6期178-182,共5页Electronic Design Engineering

摘　　要：针对于工业PLC模拟信号的采集和输出，本文提出了一种基于ADuC7061的高精度模拟前端设计方案。该系统支持双通道的PLC模拟信号输入并提供一路PLC标准电流输出。该系统在-10～70范围内达到0．2％的电压测量精度和0．2％的电流输出精度。硬件部分以ADuC7061作为测量和控制核·心，配合外围模拟调理电路完成模拟信号的调理、检测和输出，并通过隔离的SPI进行数据通信。软件部分包括模拟信号采集转换和通信，可以根据温度变化自动校准。本设计具有精度高，软件灵活，接口通用的特点，可以作为PLC模拟前端，广泛应用于工业现场。For industrial PLC analog signal acquisition and output, thisarticle presents a precision analog front-end design based on ADuC7061. The system supports dual-channel PLC analog signal input and provides a channel for standard PLC current output. The system reaches a voltage measurement accuracy of 0.1% andthe current output accuracy of 0.2%. The systemuses ADuC7061 as the core of measurement and control. With different external analog conditioning circuit, the system can both measure theinput analog signalandoutput PLC standard current signal. By using SPI interface, the system can transport data and command. The software of this systemis able to acquire flexible automatic temperature calibration. This high- precisionsystem has flexible software interface, which can be used as PLC analog front-end, and the system can be widely used in the industrial field.

关 键 词：ADuC7061 模拟前端 信号调理 电流源 高精度 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]