SR469-P1-LO-A20-E

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SR469-P1-LO-A20-E

自二十世纪六十年代美国推出可编程逻辑控制器（Programmable Logic Controller，PLC）取代传统继电器控制装置以来，PLC得到了快速发展，在世界各地得到了广泛应用。同时，PLC的功能也不断完善。随着计算机技术、信号处理技术、控制技术网络技术的不断发展和用户需求的不断提高，PLC在开关量处理的基础上增加了模拟量处理和运动控制等功能。今天的PLC不再局限于逻辑控制，在运动控制、过程控制等领域也发挥着十分重要的作用。 作为离散控的制的首选产品，PLC在二十世纪八十年代至九十年代得到了迅速发展，世界范围内的PLC年增长率保持为20%～30%。随着工厂自动化程度的不断提高和PLC市场容量基数的不断扩大，近年来PLC在工业发达国家的增长速度放缓。但是，在中国等发展中国家PLC的增长十分迅速。综合相关资料，2004年全球PLC的销售收入为100亿美元左右，在自动化领域占据着十分重要的位置。
PLC是由摸仿原继电器控制原理发展起来的，二十世纪七十年代的PLC只有开关量逻辑控制，首先应用的是汽车制造行业。它以存储执行逻辑运算、顺序控制、定时、计数和运算等操作的指令；并通过数字输入和输出操作，来控制各类机械或生产过程。用户编制的控制程序表达了生产过程的工艺要求，并事先存入PLC的用户程序存储器中。运行时按存储程序的内容逐条执行，以完成工艺流程要求的操作。PLC的CPU内有指示程序步存储地址的程序计数器，在程序运行过程中，每执行一步该计数器自动加1，程序从起始步（步序号为零）起依次执行到最终步（通常为END指令），然后再返回起始步循环运算。PLC每完成一次循环操作所需的时间称为一个扫描周期。不同型号的PLC，循环扫描周期在1微秒到几十微秒之间。PLC用梯形图编程，在解算逻辑方面，表现出快速的优点，在微秒量级，解算1K逻辑程序不到1毫秒。它把所有的输入都当成开关量来处理，16位（也有32位的）为一个模拟量。大型PLC使用另外一个CPU来完成模拟量的运算。把计算结果送给PLC的控制器。

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选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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