Role Of Power Supply

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berad said:
What is the Role Of Power Supply In Plc System ?
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That is a very large and shadowy question, Berad.
Is it a homework question or one that you have come up with on your own?
There are several things that might be referred to in the "role of power supply" in that context. I will mention a couple, and would like you to build from there with your ideas of what might be useful distinctions.

1. The first is the operation of the PLC itself. The PLC consists of active solid state logic that requires power, yes?
2. The input sensors of the PCL (digital or analog) might require external power. Or are they powered by the PLC itself?
3. Whatever is controlled by the PLC will require power of some sort. Does it have its own power source or is it driven directly by the PLC outputs?

Are there potentially different answers to the above questions that depend on the details of a particular PLC operation?
Are you studying PLCs yet, or are you looking ahead to a field you are interested in?
In any case, welcome to our Forum. Although we concentrate on the National Electrical Code, we do discuss a lot of other things related to the electrical professions.
 
GoldDigger said:
The PLC consists of active solid state logic that requires power, yes?
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The reason you need a power supply for a PLC is the same reason you need a power supply for any solid state electronic device. The power needed for the device (computer, TV, Radio, stereo )is a low voltage DC. It not only needs to be low voltage DC but fairly clean and regulated. The power supply takes AC current and converts it to DC and the regulates and filters it to clean it up.
 
Seems an odd question to pose on an electrical forum.
Or am I the only one who sees it that way?
 
ptonsparky said:
Seems like a basic question, with a lot of answers by the looks of it. He might as well get less confused here as anywhere.
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The profile of the OP says that he/she is a student in India. Seems a basic question to me.

I know plenty of people that wouldn't have any idea of what a power supply is.

I doubt if you could give a really good answer short of writing a book on the subject.
 
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