Answer / jignesh patel(abb)

field bus is a digital communication link between field
instruments and process control system like DCS,now a days
field bus is widely used for transmitting of signals
The type of field bus is...
1.Modbus
2.Profibus
3.Foundation fieldbus
4.CAN
5.Profinet
6.Ethernet.

Answer / patrik

field bus is the latest technology used in the process
industry for transmission of signals.it eliminates the heavy
wiring used in the traditional 4-20 mA transmission.it also
enables the manufacturers to use the latest SMART devices
avilable in the market .

Answer / faiyaz ahmad

Field bus is communication protocol which is used to communicate between the transmitter and controller like PLC and DCS Transmitting and receiving the signal through a Field bus protocol.

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draw shematic diagram of c/v positioner(smart type)?

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Introduce yourself which is not present in your biodata?

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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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what is the difference about HART, and 4-20mA signal?

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what is function of sensor, and how is it work , explain with difination

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