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.

i want the equation of this question. Tranmitter range is 120 mmwc and dcs flow range is 1700 nm3/hr. if i want to change dcs range from 1700 to 2400 nm3/hr then how much dp i have to enter in transmitter

2 Answers   GMR,

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what is span value and zero ? and how set ?

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Who to difference between analog in & analog out in dcs?

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need to calculate flow rate with the help of dp range and orifice bore dia and size. range is 0 to 400 inwc and orifice size is 12 inch 150 # rf and bore dia is 7.180 inch. need to calculation for flow rate

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why use on -off control valve in glove valve

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Q- Control problem are mainly classified in _____ types. a-)4 b-)3 c-)6 d-)nono of these Few of them i know is 1- regulator type problem (eg- Air conditioner) 2- tracking problem (eg missile trcking problem) 3- sybernatics 4- optimal control problem

0 Answers   Sail,

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How much voltage we are using at switches?

4 Answers   Edac,

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the pump holds on run indication into the dcs and filed local control panel remote push button condition operaton wrong like when the push button pushing conditions the pump is off and the push button release condition the pump is on totally opposite condition . And control room inside give the stop command into dcs just 1secon relay engage and again normal condition. How can I slove

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flow transmitter range is 0 -500 mmwcc but the transmitter shows 12 ma for o mmwc instead of 4 ma ...how to solve this problem when we apply 375 mmwc it shows 16 ma

3 Answers  

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In Increasing temperature why thermocouple used and RTD is not used. Both RTD and Thermocouple have in Range of uses.

5 Answers   L&T,

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What is an antisurge control system, how it works?

3 Answers  

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