Electric VS Electronic Earthing For PLC RACK/Chasis

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    Hi , i would like to knoe the pros & cons of using electronic as well as electrical earthing if reference to PLC chasis ( Controllogix Rack ). as i am from automation industry i have very limited electrical knowledge.


    Any amount of help is appreciated .




    Pranav Sharma.


    I’m not sure I understand your question. I assume that by electrical earthing you are referring to your AC power source ground or earthing. This is a fundamental part of your power distribution and should always be available to your equipment. For electronic earthing, I assume you are talking about the input and output sections of the PLC. If you are using AC modules, then your neutral should be very close to the earth potential. You may, however, be able to measure a small voltage (less than 5VAC) between neutral and earth/ground depending on several factors.

    If your I/O modules use DC power, then you may not want to use any earthing connection because your DC power is usually generated from AC power. A connection to earth/ground on both sides of that power supply may cause a partial short circuit inside the power supply. Most of the newer power supplies now have complete isolation but any noise from the AC side can infiltrate the DC side and cause problems.

    Mixing AC and DC successfully takes some specific electrical knowledge and then verification if you attempt it.

    sakindra gupta

    Dear sir, each and every earthing is common for all uses but some term is consider.

    PLC earthing is separated from electrical earthing please provide the copper earthing for PLC and GI for electrical.

    electronic PLC Chassis should be isolated from body. and check continuity from electrical earthing to electronics earthing.

    kindly note:

    PLC earthing direct connection to electrode not in common grid or bus link.


    Thanks for the information. I want to know more on PLC. As far as I know about PLC it is Programmable Logic Controller.

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