《2711-NB3》

发布时间:2016-08-15

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2711-NB3

2711-NB3

  3.PLC供电系统
    供电系统的设计,必须根据控制对象的性质、技术要求、系统的组成情况、使用环境条件等进行具体分析,本章后述部分给出了PLC控制系统硬件设计实例,可以供读者参考。
  作为PLC供电系统基本设计原则,应注意如下几个方面:
  ①在系统中,与PLC有关的全部电源,均可以通过设备的电源开关进行分断,实现与电网的隔离。
  ②PLC作为系统主要的控制装置,原则上应在设备电源接通后,无须其他启动操作,即可以立即投入工作,以便控制系统对控制对象实施有效的监控。
  ③对于同时使用基本单元与扩展单元的控制系统,扩展单元的电源应先于基本单元或同时接通,以便基本单元对扩展单元实施有效的监控。

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