Answer / ramesh

DCS:- Actually DCS is used for redudancy ,it will have two controllers with master and slave concepts with communicating to the slave nodes and every nodes will be communicating with the particular node addresses.It will have larger no of analog I/o but in PLC is best for larger no DI/DO s,so in power industries we will use larger no of AI/AO s ,so we are going for DCS,and moreover in DCS the scanning time and the memory speed will be greater when compared with the PLC.We can use larger no of inputs and outputs in dcs whereas in PLC we cant use larger no because of lack in redudancy controller.So,in process industries if one controller is tripped then the second controller will take in to account and the plant will not get tripped.

Explain the key components of control loop?

0 Answers  

---

can we replace a pressure transmitter of range 0 to 25 Kg/cm2 by a Pressure transmitter of range 0 to 10 Kg/cm2 ?.. Will it affect 4 to 20 mA output signal which we will feed to the PLC.

9 Answers   IOCL,

---

what will the sending unit in the fuel gauge utilizes?

0 Answers  

---

p=hdg,please explain these parameters?

7 Answers  

---

how to overhaul control valves.what are the proper procedures.

1 Answers   Jindal, QAFCO,

---

Why do we use triad cable for RTD to Temp.transmitter connection? Why we don't use 3 core cable?

1 Answers   Process Control Technologies,

---

What are the application of bernoulli’s theorem?

0 Answers  

---

What is the detail function of I/O card in DCS ? Why we dont use the I/O directly with controller?

3 Answers   Kekran Mekran, TCE,

---

What is the difference between a double acting and single acting positioner? what type of valves use single acting positioners?

1 Answers   AquaTech, NamPower, Samson Resources,

---

what is flow

2 Answers  

---

what is the input of digital RPM indicator during the calibration time?

1 Answers  

---

how can i check vortex shedder bar it is ok? if there is ohms condition are shown correct?

0 Answers   Chevron Phillips,

---