SGDH-1EDE

描述

SGDH-1EDE

近年来市场上也出现了一些采用单片机，工控机控制的控制器。但是，采用单片机开发的控制器由于抗干扰能力差，人机界面不够友好，操作繁琐，给用户带来了很多麻烦，所以，也没有得到普及。而采用工控机控制的控制器由于大多是国外引进的产品，全英文界面，不仅操作繁琐，而且价格昂贵，大多数用户不能接受。因而也得不到推广，本文介绍的控制器正好填补了这一空白。它不仅体积小，接线简单，人机界面友好，维护方便；同时控制精度高，运行可靠，使制冷系统中制冷剂的压力波动很小，制冷效果好，冷藏品得到了很好的保护；最近用于冷链中广泛使用的并联机组，对冷量变化的精确调节和压缩机运行寿命的均匀调节，非常适合并联机组的实际使用情况；并且，价格适中，因而受到了广大用户的普遍欢迎。五年来全国累计四十多套投入运行，运行情况良好。 随着工业生产自动化水平的不断加快，对控制系统提出了愈来愈严格的要求。随着大规模集成电路广泛应用，控制系统本身也得到长足发展，已由原来的分立元件、继电器控制，发展成为大规模集成电路的微机控制。控制方式也由原来的分散控制发展为集中控制。正是在这种发展的需求下，可编程控制器应运而生。由于可编程控制器（PLC）具有体积小、抗干扰能力强、组态灵活等优点，因而在工业控制系统中得到非常广泛的应用。
在电缆自动生产线检测控制系统中，可编程控制器主要用作下位机，检测各状态点的状态，直接控制系统的启、停和其他控制单元的投切，并将各点的状态送给上位机——计算机，计算机综合可编程控制器和其他设设备的数据，作出相应的处理和显示。关于整个系统的设计与实现另文介绍，本文主要介绍该系统中用作下位机的可编程控制器的作用、与计算机的通讯及程序设计方法。

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