140CPU65150C

一、疑问布景

        上海正航电子科技有限公司如今供给的plc按输出类型分可分为继电器输出型和晶体管输出型。继电器输出的供电电压为市电沟通220V，晶体管输出的供电电源为直流24V。在运用中客户常常会用开关电源为晶体管输出的PLC供给24V电源，可是为PLC供电的开关电源除了给PLC供电外，还也许会给一些接触器，电磁阀供电。由于PLC供电电源电路中存在理性元器材，理性元器材由于反向电动势的要素会对PLC的24V带来冲击，然后致使PLC的损坏。因而，需求在PLC供电电源外部加接一些维护电路，以防止PLC的损坏。

城市交通操控体系可以有用改进交通，减轻交通拥堵，行进路网的效劳水平，增加体系交通流量，削减延误时刻和泊车次数，削减燃油消耗，下降交通噪声及尾气带来的环境污染，行进交通性，然后推进城市经济建造的进一步展开。

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