2711PK7C4D8

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2711PK7C4D8

 这是一个长久以来困扰我们所有工控人的问题。我们可以参考下IT界的变量命名规范，如：如何优雅地为程序中的变量和函数命名？然后我们也可以从中了解到一些匈牙利命名法、google风格等称谓，但即便你把这些规则全读懂了，也会发现，好像对于我们工控项目来说，能参考的地方不多，因为，他们用到的变量跟我们相比，数量根本不在一个数量级！工控项目，用到的硬件点数几百点是很平常的，稍微规模大一点，就是几千点甚至上万点。而除了硬点之外，还要有一些通讯和上位控制的虚点，加起来数量就更多了。这些点，全都相当于高级编程语言里的全局变量。任何一个高级语言编出来的程序，功能可能比我们做到的复杂，但全局变量，绝不可能用到这么多。除非那是个新手，不懂得要模块化编程。所以，最终工控项目的变量的命名规范，我们能参考到的可借鉴的经验只有，用英文！即便英语不够好，也得坚持用英文。因为，中文实在不方便作为变量名字，没法简略，太长，还不容易输入。其次也不可以使用汉语拼音。完整的拼音也是太长，而且同音词太多引发歧义多，不能精确描述。而简化了使用拼音首字母的连拼，写出来后简直是天书，除了作者自己，别人根本不可能看懂说的是什么。而且即便作者自己，时间稍微一放，回过头来就不明白啥意思了。其实一个规范的工程项目，所有设备，都应该有位号，所以在变量命名的时候，最简单的方式是使用位号来命名，而同一位号之下的各种输入输出，手动、自动、启动、停止、打开、关闭、运行反馈、故障、开度、频率等等，就可以统一规范的使用英文了，毕竟这点英文单词数量还不算多。而具体到位号的命名以及链接了后面的功能点的命名，就不可避免要出现链接符号，综合S7的符号表的命名规则和WINCC的变量的命名规则，很多符号是禁止使用或者使用中有风险的。比如:/\<>!+,;等基本都不能使用。作为分隔符来说，点（.）是最方便的。但可惜的是，WINCC已经缺省当作是结构变量的分隔符了，如果如链接S7-200,S7-1200的变量，不能使用结构变量，直接通过OPC传输的变量，则无法再使用点(.)减号（-），现实的文档中经常用，但我说有风险的恰恰就是它。

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Enlarge
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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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