使用技巧文集

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1、LEC使用技巧文集-0-0LEC使用技巧文集编者的话今天的LEC，不仅有完善的产品线，更拥有具备多年现场经验的资深技术工程师。我们把这些智慧和经验融合为一体，完成了《LEC使用技巧文集》一书。本文集主要面对的读者群体是具有一定技术背景，并且曾经使用过施耐德小型PLC或者对LEC产品感兴趣的技术工程师。文集内容主要分为两个部分：Twido可编程控制器和ZelioLogic逻辑控制器。它不仅针对产品介绍了一些常见的使用技巧，如“TwidoPLC的通信宏功能”，“运用高速计数器实现频率检测的方法”等等，而且就控制理论结合实际应用作了详细而深入的研

2、究，如“如何用自编的PID算法来实现控制·”，“施耐德电气小型PLC实现顺序控制的技巧”等等。这些文章都是LEC资深技术工程师在经过多年经验积累，并且已经在现场得到成功的运用，从而总结出来的佳作。我们真心希望把这些多年现场调试和使用LEC产品的经验与大家分享，使广大用户能够更好地使用LEC产品，解决实际应用中的问题，并且借此机会搭建一个与广大使用者进行技术交流的平台，更好地为大家服务。由于时间和水平有限，在文集第一版里，不可避免的会有些错误和不详之处，敬请大家给予谅解，在文集最后，附有“LEC使用技巧文集意见反馈表”，我们真心期待您的宝贵意

3、见，只有您的意见，才能使文集不断得到完善，才能推出更好更有用的LEC丛书。在不久的将来，一本经过不断完善，更具专业水准的《LEC使用技巧文集》系列丛书将会呈现在您的面前，相信到那时，会刮起一股比今年夏天更热的旋风—LEC之风。在这里还要感谢给予大力支持的LEC领导艾小明和陈沛巍；在百忙之中贡献文章的沈建忠，何荣林，杜汕波，张福和刘金兵；内部评审委员会成员艾小明，刘金兵，张笑丰，储云峰，何荣林和荣东坡，以及其他给予帮助的各位同仁。总之，没有他们的帮助，就没有今天的文集，谢谢！许映巍2005年6月-1-1LEC使用技巧文集目录第一节Twido可

4、编程控制器1.如何用自编的PID算法来实现控制·····················································································32.ASCII码转换为HEX和BCD码的方法··············································································53.TwidoPLC做为ASCII从站设备的通讯方法·····································

5、·································74.Twido和台达VFD_B变频器Modbus通讯的实现···························································115.如何用VB实现Modbus串行通讯······················································································166.如何用VB实现Twido的ModbusTCP/IP的通讯············

6、················································207.TwidoASCII通信格式·········································································································248.如何使用OFS与Twido通信···················································································

7、·········299.如何使用TwidoSoftmacroscomm宏功能·········································································3410.施耐德电气小型PLC中字变量MW的巧用····································································3911.施耐德电气XBTG系列触摸屏应用中大量采集位信号的技巧·····································

8、4212.施耐德电气小型PLC实现顺序控制的技巧·································································