国内PLC厂商的服务由公司相关人员去实施，PLC生产厂商可以直接面向终用户。由于公司技术人员充分了解自己的产品，能够迅速解决实际应用中发现的问题，因而能显著提高服务水平和服务质量。另外，国内PLC厂商可以在PLC的售前、售中和售后中为用户提供免费增值服务。例如，面对众多的中小用户，和利时公司开展了免费培训和免费方案设计服务，得到了广大用户的一致好评。
系统技术文件包括说明书、电气原理图、电器布置图、电气元件明细表、PLC梯形图。
7DO139.70
847026-209R
与个人计算机相比，PLC在标准化方面作得较差：PLC的软、硬件体系结构是封闭的而不是开放的；绝大多数PLC使用专用的总线、专用通信网络及协议；各种PLC产品的编程语言在表示方式、寻址方式和语法结构上都不一致，使得它们互不兼容。国际电工委员会的IEC6113l-3《可编程序控制器的编程软件标准》为PLC编程的标准化铺平了道路。不少厂家正在开发以PC(个人计算机)为硬件平台、在Windows操作系统下、符合IEC61131-3国际标准的新一放体系结构的PLC。
PLC的问题是没有人发现真正的问题所在。根据近期的市场调研，大多数工程师仍然认为数字技术提供了节省空间的机会。而数字芯片在PLC模块中仅占据15%至20%的电路板空间。真正的问题在于模拟和分立元件占据绝大多数的PCB空间。这些器件在PLC模块中占据高达85%的电路板空间。而这些器件不像数字芯片那样具备大规模集成，所以需要更高集成度来节省PCB空间。
在作出系统控制方案的决策之前，要详细了解被控对象的控制要求，从而决定是否选用PLC进行控制
用接口电路的结构如下图所示。
联系人：李工[销售工程师]
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公司全称：
福州卓凯电子科技有限公司
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福建省福州市闽侯甘蔗街道阳光城领海1栋2608室
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