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IC697CPM790 +QQ 2653339695 现货 低价找小赵18020776785
IC697CPM790 本公司有大量库存现货,全新原装,欢迎订购,当天可发货!!!!!!
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IC697CPM790
IC697CPM790
当开关量I/O线不能与动力线分开布线时,可以用继电器来隔离输入/输出线上的干扰。当信号线距离超过300m时,应采用中间继电器来转接信号,或使用PLC的远程I/O模块。
I/O线与电源线应分开走线,并保持的距离。如果不得已要在同一线槽中布线,应使用屏蔽电缆。交流线与直流线应分别使用不同的电缆;开关量、模拟量I/O线应分开敷设,后者应采用屏蔽线。如果模拟量输入/输出信号距离PLC较远,应采用DC4~20mA的电流传输方式,而不是易受干扰的电压传输方式。
传送模拟信号的屏蔽线,其屏蔽层应一端接地,为了泄放高频干扰,数字信号线的屏蔽层应并联电位均衡线,其电阻应小于屏蔽层电阻的1/10,并将屏蔽层两端接地。如果无法设置电位均衡线,或只考虑抑制低频干扰时,也可以一端接地。
不同的信号线好不用同一个接插转接,如果用同一个接插件,要用备用端子或地线端子将它们分隔开,以减少相互干扰。
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