联系人：黄晓飞（销售工程师） 移动电话:18030263579 固话: QQ：2472574325?
当前，PLC的生产厂家相继推出了一些智能式的I/O模块。一般智能式I/O模块本身带有处理器，可对输入或输出信号作预先规定的处理，并将处理结果送入CPU或直接输出，这样可提高PLC的处理速度并节省存储器的容量。
综上，表3归纳了选择I/O模块的一般规则。
存储器类型及容量选择
PLC系统所用的存储器基本上由PROM、EPROM及RAM三种类型组成，存储容量则随机器的大小变化，一般小型机的最大存储能力低于6kB，中型机的最大存储能力可达64kB，大型机的最大存储能力可上兆字节。使用时可以根据程序及数据的存储需要来选用合适的机型，必要时也可专门进行存储器的扩充设计。
PLC的存储器容量选择和计算的第一种方法是：根据编程使用的节点数精确计算存储器的实际使用容量。第二种为估算法，用户可根据控制规模和应用目的，按照表4的公式来估算。为了使用方便，一般应留有25%～30%的裕量，获取存储容量的最佳方法是生成程序，即用了多少字。知道每条指令所用的字数，用户便可确定准确的存储容量。表4同时给出了存储器容量的估算方法。
编程器和外部设备的选择c应当对所选择PLC产品的软件功能及编程器有所了解。通常情况下，小型控制系统一般选用价格便宜的简易编程器，如果系统较大或多台PLC共用，可以选用功能强、编程方便的图形编程器。如果有个人计算机，可以选用能在个人计算机上运行的编程软件包。同时，为了防止因干扰、锂电池电压下降等原因破坏RAM中的用户程序，可以选用EEP-ROM模块作为外部设备。
（一）利用三菱PLC实现对印刷机的精确控制
印刷机的一套电气设计属于系统设计，为了使产品性能稳定，易于维护，采用以PLC为主控器的控制方案。印刷机要求易于操作，精度高，输入、输出点较多，因此采用双机通讯。上位机采用三菱高性能的FX2N-80MR、FX2N-80MR自带I/O接口，可以接40点输入，40点输出，主要负责主传动的控制，各机组离合器的控制，以及气泵，气阀的控制等。下位机采用三菱FX2N-64MR、FX2N-64MR可以接32点输入，32点输出，主要负责水辊电机的控制，主传动的调速输出，调版电机数据采集等。上位机与下位机采用RS485, 通讯，通讯方便，可靠。同时选用了一台三菱5.7寸触摸屏，主要负责水辊电机速度显示，调版显示，以及整机故障显示等。本系统运行可靠，维护方便，操作简便直观，大大提高了胶印机的档次。
（二）欧姆龙（OMRON）PLC在石油加工工业中的应用
在石油加工工业中，大型旋转机组是装置设备的重要组成部分，重油催化裂化气压机组的联锁-自保系统从满足工艺生产需求出发，考虑到安全性、可靠性、经济性、可扩展性等因素，采用了OMRON公司生产的CPM2AH型PLC进行系统构建，CPM2AH自带I/O接口，可以接36点输入，24点输出，输出形式是继电器，并且通过RS232C串口与PC
主要业务:
ABB DCS卡件
Ovation系统模块
Foxboro系统卡件
Triconex系统模块
Rexroth力士乐全系列产品
Modicon停产模块 等各类工控产品
Schneider（施耐德） 140系列PLC,CPU
Siemens 6DD，6FX，6SC，6FC，6S5系列
AB 1746，1756，1747，1785系列 PLC CP
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NI-5752配件
NI-5752配件
NI-5752配件
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BALDOR ID15H420-E 20HP 460V AC DR
BALDOR ID15H420-EO 20HP 460V AC DR
