Answer / midhun pius 09946626427

Basically relay is a electromagnetic device,we can't do any
changes in its mode of operation it is works only normally
open/normally closed conditions as per its default
manufacturing set up.
But a PLC is a Programmable Logic Controller. It has a
number of inputs and out puts, we can define its conditions
by using a computer program known as Ladder Logic program.
Any time we can easily change that conditions by the ladder
program1

Answer / roy.bijoy067

a relay use in conventional system and it working/operation
is fixed put plc is used in automation system and it
operation can be change according to our need.

Answer / rajesh

a relay is just a small part and is usually a part of plc
plc is a system which has number of i/o controls


plc is much large compared to a relay

What is the use of lag compensator?

0 Answers  

---

What is the purpose of shunt trip in ACB function?

1 Answers  

---

which of the following can produce maximum induced voltage..... (a)1amp dc current (b)50amp dc current (c) 1amp 60 cycle ac current (d)1amp 490 cycle ac current.

2 Answers  

---

what is the cause of voltage dipp or swell in the transmission lines?

0 Answers  

---

how to introduce yourself

0 Answers  

---

what is induction motor

2 Answers  

---

what is the role of frequency in electrical system

2 Answers   Hindalco,

---

What happens when the polarity changes in CT? Explain briefly?

4 Answers  

---

operating Lt & HT voltages used in India?

8 Answers   Essar,

---

what is an rmu?its circuit diagram.functions

14 Answers   CP Bangladesh, Emrill, NDPL,

---

what is the minimum clearance between a 11KV 150KVAR capacitor cell and series reactor.can a series reactor can be mounted in the same structure of the capacitor cells structure

0 Answers   APTransco,

---

What it is the diff btw Package & PEC AC's????

2 Answers   Emerson,

---