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Question
modbus and profibus communication difference?
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
The philosophy for modbus and profibus is same.....the
difference is
1.modbus you can go up to 1200m only in the case of profibus
you can go up to 2-5 km.
2.In modbus the speed will be 125kbs where profibus it will
be 1.5 mbs to 12mbs.
3.In modbus you can connect maximum 32 devices for RS485
where in Profibus you can go upto 127devies without repeater.
 
Is This Answer Correct ?    14 Yes 3 No
Jignesh Patel(abb)
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
Somebody ask me how many size of control valve what is mean of control valve size?   1
what is coriolis principle for mass flowmeter? ABB 4
What is a snubber circuit?   2
What is sensitivity of K type thermocouple? Is polarity important in thermocouple connections? Honeywell 3
what is the diffirence between Earth and Neutral   4
When a field input to plc is coming from 400 to 600 meters and the input is in 24 V DC? So signal cable of which cross section i should select for proper signal to plc? Exxon-Mobil 5
how we can calibrate level transmiiter in field?   5
what is the difference between laminor flow and turbulant flow Invensys 2
plc trouble shootings?   3
How to force the bit in GE Mark V?   1
how to calibrate displacer type level transmitter by dry weight method please mention formula for weight calculation   1
what is seebeck effect?   7
 
For more Instrumentation Interview Questions Click Here 
 
 
 
 
 


   
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