本文针对当前主流PLC产品(如A-B、MODICON、SIEMENS、OMRON等)的通信网络进行了研究,从分析结构、性能、应用范围等出发,获得对PLC通信网络深刻的认识,以期能够掌握当前PLC通信网络技术的发展趋势和主流PLC各自的性能及优缺点,为我国的PLC控制系统的良好应用与相关产品的开发提供借鉴。 This text has carried on the research to the communication network of the present mainstream PLC products (such as AB, MODICON, SIEMENS, OMRON, etc.), From analyzing the structure, characteristic, application range and so on, obtains the deep understanding to PLC communication network, hopes to be able to grasp current PLC correspondence Network technology trends and the mainstream of their respective performance advantages and disadvantages of PLC control system for our good application and related products to provide reference.