ABB TC630 可编程控制器

ABB TC630  可编程控制器

在电路图设计中我们早已经在使用针对控制对象的绘图方式，即把基本的主配送电路和PLC配置完成后，我们会针对每一个现场控制对象如：电机、阀、气缸等控制对象绘制电路图，他们的电源来自主配送电路，控制和反馈与PLC建立连接，硬件连锁根据实际情况调整，一个个控制对象就象搭建积木一样有组织的堆积起来，同样的，编程也是针对一个个控制对象使用相应的标准控制块实现就可以，把程序控制细节实现了有效的封装，使程序看起来简洁和易于维护，而好的设计可以把原理图和程序进行很好的关联，甚至于做到一对一的关系，如原理图中的一个控制对象可以在程序中找到相应的FB调用与之对应，真正做到面向控制对象编程。

可能有人疑虑，PLC编程大部分是步进编程，这一个个标准块都是针对控制对象的，那控制顺序如何实现呢？这就要求编写专门的顺序控制FB块，或者使用Siemens现成的Graph7来实现，这点与一般编程没什么差别。

现在的工业控制领域有很多程序高手，他们很精通算法，也有着自己的编程理念，当我和一些人探讨标准化时，他们认识到标准化的高效性，但认为这样无法体现自己的编程水准，是的，如上所述作为应用层面的程序设计是不要很高的编程水平，但要想想，一个人难道能一辈子去搞现场调试吗？若想体现自己的价值，可以从事标准编程。我更希望他们能花一点时间研究程序架构，各行各业，真正的大师是系统架构设计者，编程小技巧只不过是为好的架构锦上添花。

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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。