P0800DC-FOXBORO

P0800DC-FOXBORO

采用直接上网的结构，必须妥善解决PLC直接上网后智能设备的接入问题。采用直接上网的结构，坚持分层分布（单元）式的结构原则，就是要达到与LCU有关的各种数据采集和控制都必须由LCU来实现的目标。现在，LCU一般都需要与一定数量的智能设备进行通讯。在有工控机结构的LCU结构中，通讯实现是比较容易的，通讯的方式也比较灵活。但在采用PLC直接上网的结构后，就必须考虑各种PLC产品特性对接入LCU智能设备的影响。PLC与工控机相比，通讯接口少，方式比较少。LCU智能设备接入问题，解决的总的方法有两种，一种是直接或经转换接入PLC，一种是直接接入以太网。由于各种PLC产品分别产于不同的公司，它们的特性也各不相同，因此实现智能设备接入PLC的方法有多种多样。在比较国外主要PLC产品特性基础上，在满足分层分布（单元）式的结构原则前提条件下，对智能设备接入LCU的方法进行分析对比，从它们的特性中，力图找出共性的方法，侧重于通讯速率、实现方式、是否需要编程、接入智能设备的数量、是否易于维护等方面。

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