Is PLC Only Required in All Industry?

This is not a free homework service.

Do some basic research BEFORE YOU ASK US TO EDUCATE you!!!!!!!

BASIC RESEARCH IS EASY!!!!!!!

Search for "control systems" and read about them first.

Or, take a controls course. You can probably finr some free one's if you knew how to search.

GO HERE FIRST.

How to Search the Internet Effectively

Yes, the PLC is used alone in industry and in combination with software such as SCADA or DCS?

Not at all sure that we understand what DCS and SCADA really are.

This is why OP needs to have a basic understanding of control systems and hardware and software used for same, before asking for infusion of knowledge. He keeps asking for fish, when he really needs a fishing pole.

"He keeps asking for fish, when he really needs a fishing pole."

And perhaps the correct bait!

I can't remember who used the video test pattern, and I don't recognize the 'UV Mushrooms' avatar.

Both.

To know the answer chech out the link : http://aboutinstrumentation.blogspot.in/2011/01/industrial-automation-using-plcs.html

to know diffrence between DCS and PLC

please visit

http://plc-scada-dcs.blogspot.in/2011/12/diffrence-between-plc-and-dcs.html