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.

can u please tell me the different types of valve uses and wt purposes it is used ~!(controlling the flow other than that which valve should be used in what place)

2 Answers  

---

how to calculate MMWC values in to Tonns(MMWC values showing in DP transmitter and Tonns value showing in Totalizer). please tell me details?

2 Answers   Chemin C I, MSP,

---

What are difference between automatic and manual control system?

5 Answers  

---

What is 3 element control system

0 Answers  

---

what sud u do if u dont get feedback from control valve?

1 Answers   Siemens,

---

---

What is trim material . Why it is known as trim.

1 Answers   L&T, LNG,

---

how radio frequency level probes works with its controller ? what is its principle ? pls give me brief explanation?

0 Answers  

---

What are Sinking and Sourcing IO Cards

2 Answers  

---

what is the responsibility of an instrument commissioning supervisor

0 Answers   Petrofac,

---

what should be distance from tapping point to inallation place of instruments?

3 Answers   Tasnee Petrochemicals,

---

I m appointed as an automation trainee engineer in small firm in that I am only the one , my company give me a project on s7-200 as i m beginner I don't know how to program so please send me the helpful site so that I complete my project before deadline....please help me out in this critical situation.

0 Answers  

---

Draw a complete P&ID of a flow suction tank indicating all control & protection equipment. Indicate all its inlets and outlets. Explain the controls for this system

0 Answers  

---