ABB YPQ-101E YT204001-FS

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ABB YPQ-101E YT204001-FS

在它上面我曾经吃过亏，一个晚上几个小时，翻来覆去倒腾好几次变量，都是因为这个减号。这里，我只需要提两件事大家可以测试一下：你在单独起变量名字的时候，不管在S7中还是WINCC中，都是合法的可以使用的，但如果使用WINCC7.2的变量表复制粘贴功能，你从WINCC复制到EXCEL还是可以的，但倒过来复制的时候，所有变量名里面的减号都给变成了下划线(_)。还有是，如果是模拟量需要进行变量归档，如果又使用了压缩归档，那么在压缩以后，不知道啥时候变量名也给变成了下划线(_)!是的。原来最好用的是下划线。其实也只有下划线最好用，所以所有人在命名的时候本来也都喜欢用它，最终一个完整的位号加功能链接起来后的变量就会到泛滥的程度，这就就又出现问题了。比如：LS_DT_8_LEAK_FLS_DT_9_LEAK_FLS_DT_12_LEAK_FLS_DT_13_LEAK_F这些变量名，在WINCC中使用是没有问题的，但如果我要用到变量前缀功能呢？如果WINCC程序处理中需要通过变量的分隔符来确定位号和功能，这么多下划线可就乱套了。在去年年底的一个项目中，我曾经非常痛苦的每天晚上花4-5个小时来处理几千个变量的变量表，配合方每发来一次更新的变量表，我就要处理一次，以达到程序可用的规范。更换掉不可以使用的字符，更换掉不合适的使用了下划线的变量。直到最后，项目已经完工了，突然想到了一个更容易的解决方案，既然滥用下划线，那索性更滥用好了，分隔符的地方，使用连续两个下划线(__)可好？比如上面的变量名就变成：LS_DT_8__LEAK_FLS_DT_9__LEAK_FLS_DT_12__LEAK_FLS_DT_13__LEAK_F我只要和配合方在递交变量点表的时候提前约定这样一个规范不就OK了么！然后转过年来，又一个WINCC报表项目，我查了下项目中的变量的命名方式，直接提出了这样的要求，所以变量名字就变成了：FT-2128__LFT-2128__SFT-2128__DFT-2128__MFT-BCEG01__LFT-BCEG01__SFT-BCEG01__DFT-BCEG01__M当然朋友在做的时候是一头雾水，不明白为啥要这样，现在看到这里，应该也明白了吧！至于变量名中还有的减号，因为变量已经建立，已经既成事实，就只好将错就错了。

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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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