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Question
what is difference between modbus & fieldbus
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Modbus is a Modicon bus it doesnt require dedicated
interface card as it required for fieldbus(Profibus) Modbus
can communicate from serial printer port via RS-485 n RS-
232 while Fieldbus can communicate from RS-485 ONLY.
 
Is This Answer Correct ?    44 Yes 14 No
Hemant Bhati
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
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Why even multiple power supplu r used in instrumentation system? Honeywell 1
If an Instrument has 550 ohm internal resistance and the cable used for that instrument is 0.5 ohm per meter resistance. If the voltage is 12volt.How much length cable can be used? Please tell me its Calculation formula. MOL 5
Hi i m B.E. In elect. & comm. I m workin in bio mass plant from 6 mnths as inst. Engg. but now i m in dept. Of operation as shift engg...which is best operation or inst. 4 me? M confusd..plz help and reply me..   2
WHAT IS THE DIFFERENCE BETWEEN DCS & PLC. Reliance 9
what is datum line?   4
How to get Cv of control valve having following parameter ,i.e inlet pressure 4.5kg/cm2 outlet pressure 1 kg/cm2 specific gravity 0.808   3
An atmospheric storage tank has a diameter of 20 m and a height of 8m.It is half-full of liquid with the remainder of the space containing air normally at atmospheric pressure. If the connection to atmosphere is accidentally closed off and 10 cubic m of liquid removed, what happens to the internal pressure of the tank? What are the possible consequences for the tank?   1
explain level transmitter working   1
What is sensitivity of K type thermocouple? Is polarity important in thermocouple connections? Honeywell 3
what is the difference between CPC and i/p converter siemens 1
Why do we need to install hook-up line differential pressure type level transmitter when the differential pressure type level transmitter with capillary are available?   2
 
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