罗克韦尔产品说明22B-D6P0C104

22B-D6P0C104

PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。

● 地或电源接地

将电源线接地端和柜体连线接地为接地。如电源漏电或柜体带电，可从接地导入地下，不会对人造成伤害。

● 系统接地

PLC控制器为了与所控的各个设备同电位而接地，叫系统接地。接地电阻值不得大于4Ω，一般需将PLC设备系统地和控制柜内开关电源负端接在一起，作为控制系统地。

● 信号与屏蔽接地

一般要求信号线要有的参考地，屏蔽电缆遇到有可能产生传导干扰的场合，也要在就地或者控制室接地，防止形成“地环路”。信号源接地时，屏蔽层应在信号侧接地；不接地时，应在PLC侧接地；信号线中间有接头时，屏蔽层应牢固连接并进行绝缘处理，要避免多点接地；多个测点信号的屏蔽双绞线与多芯对绞总屏蔽电缆连接时，各屏蔽层应相互连接好，并经绝缘处理，选择适当的接地处单点接点。

22B-D6P0C104

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