Answer / sivasankari

DCS means Distributed Control System.It is mainly used to
control the physical parameters like
temperature,pressure,level,flow,humidity,etc.,

Answer / gobinath

DCS Means Distributed control system. This is working as a
master control system of full entire plant. its communicate
with all node control system (field Sub control PLC's and
control & execute the all closed loop process.

DCS -------- PLC 01
|---- PLC 02
|---- PLC 03

Answer / b_saravanakumar

DCS is distributed control system and it is used to control
a plant (ex: power plant). DCS will have its own database
where in PLC doesnt have. Also scanning time for DCS is less
than 100mSec.

Answer / seema pal

DCS is distributed control system which is geograhically
distributed and connected through a communication network.
The control stations and its sub stations can be located in
different locations of the plant.It is capable of doing
different functions since it also fuctionally distributed.

Hence, in a short, DCS is geographically and functionally
distributed.

Answer / bala

DCS-Distribured Control System

it is build with hard ware and software
this control using in process control industries like
cement / sugar / power etc...
main function is monitor / sequence of opration / control /
indication / trip(for man and machine safety)

Explain the difference between plc and cnc?

0 Answers  

anybody having Qatar Petroleum questions for instrument Technician offshore ....please send me

0 Answers  

Please asked me How calculate DCS controller memory.

0 Answers   Yokogawa,

What is Predictive Maintenance

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how many type of plug are used in pneumatic control valve,name them.

2 Answers   Godrej,

For a diafhram 1.5 d =kn(p-p0) D4 Where d in deflection in inch k=constant n=no of capdule (P-P0)=Applied pressure in psi D In active dia at capsule. -1.5 d=k to p d being constant -1.5

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what is sil (safety integrity level

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Capacitance, resistance ( colour coding ), parallel & series circuits.

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Identify the electrical variable that is either directly or inferentially used by various instruments to determine the value of a measured variable.

4 Answers  

A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

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Why we are using temperature and pressure as a reference when measuring flow of steam?

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give eg of how I/P is used in control loops

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