How 2-Wire, 3-Wire & 4-Wire Connection Done in Control System?

2-wire is done the right way and the wrong way.

3-wire is done the right way and three wrong ways.

4-wire is done the right way and five wrong ways.

Control system for what?

You really need to give the forum more to go on than one sentence, Guvnor.

what control system you are talking about....help us to help you....

is it RTD 2, 3 and 4 wire wiring system?

OK. Let me be specific.

I know about loop powered indication of a power supply of +/-24VDC, any 2 wire transmitter which operates on +/- 24VDC & whose O/P is 4 to 20mA and an indicator whose I/P is 4 to 20mA. (if I'm not mistaken then it's 2 wire connection. right? As all are connected in series).

And the above asked question by me was basically asked to me in the interview.

I answered to him about 2-wire connection. But he told me that he never had heard about such kind of connection.

So I got confused that is there any kind of connection for such kinds?

Pl. help me to know about the same.

If you need any clarification about the question pl. feel free to ask.

Thanking you.

See? Reasonably formative questions get reasonable responses... the internet imitates real life. Just like real life, the forum doesn't usually enjoy a game of "Twenty Questions".

Good Answer vote for tony, well done. You can do this as well, just hit that 'Rate' button in the bottom left-hand corner of his comment.

I agree. I'm maintaining a low profile today lest I be branded a debaser.

Yeah, I was thinking that about myself as well. You and I have been very amiable today, as has most of the group. Maybe the forum has become a kinder, gentler place to visit. Phys would be proud of us!

^{I give it about three more hours...}

O ye, of little faith.

You are not alone.

Then in that interview, I would have answered correctly, and you wouldn't, which means that I would have got the job, and you wouldn't.