基于PLC的农产品加工机械性能检测系统软件设计（毕业学术论文设计）.docVIP

PAGE PAGE i 基于PLC的农产品加工机械性能检测系统的软件设计 摘 要 随着计算机控制技术的发展，可编程控制器凭借其自身所具有的抗干扰能力强、稳定性好、可靠性高、编程简单、维护量小等一系列特点，在现代控制领域占有越来越重要的地位。目前我国农产品加工设备品种繁多、规格复杂，产品鉴定采用传统方法检测周期长、工作量大、效率低，为了使农产品加工机械在大批量生产和投放市场之前达到国家规定的性能指标和要求，本文根据系统技术指标，采用PLC控制技术研究了农产品加工机械性能检测系统的软件设计。 基于农产品加工机械性能检测系统的软件设计,主要包括两部分：一是PLC控制系统的程序设计及PLC与台达VFD-M变频器之间通过MODBUS协议的实现，二是采用组态王软件进行的人机界面设计。其中PLC控制系统的程序主要实现检测现场提升电动机、被测电动机等机器的启动/停止，以及通过RS485串口通信控制变频器的输出频率从而控制电动机的原料流量。利用组态王6.5设计的人机界面使操作人员操作简单直观明了,并通过组态王与EXCEL的链接对现场数据进行实时采集和监控。 关键词: PLC，MODBUS，VFD，组态王 ABSTRACT Along with computer control technology development, the PLC relies on the anti-jamming ability which its own has strongly, the stability good, the reliability high, the programming simple, the maintenance quantity small and so on a series of characteristics, holds the more and more important status in the modern control domain. At present our country agricultural products processing equipment variety many, the specification is complex, the product appraisal uses the traditional method examination cycle long, the work load big, the efficiency is low. In order to cause the agricultural products processing machinery produces and puts in front of the market in the mass achieved the national stipulation the performance index and the request, this article according to the system technical specification, used the PLC control engineering research agricultural products processing mechanical property examination system the software design. Based on the agricultural products processing mechanical property examination system software design, mainly includes two parts: first, PLC control system programming and PLC and frequency changer through MODBUS agreement realization; second ,uses the man-machine contact surface design which the configuration king software carries on. PLC control system procedure main realization examines the scene promotion electric motor, was measured thus machine and so on electric motor start/stops, as well as controls the frequency changer th