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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
 
what sud u do if u dont get feedback from control valve? Siemens 1
hi i want sov loop cheak from consol to field the operater given status to sov still no change, but MR room to sov ok so whats a problem and alreasy cheak all conection ok ?   2
WHY TEMPERATURE TRANSMITTER USED AS WE CAN CONTROL THROUGH THERMOCOUPLE/RTD Thermax 5
hi am durga, i just now completed my eie [2009] , can anyone please guide me what r courses i need to join to enter into core company   6
how many parts of valve positioner? Kentz 1
what is the formulae to find the thermocouple output to temperature   3
What is seismic transducer?Where it is used?   1
Why we are using sqare root in flow?   4
explain how magnetic flowmeter works   1
what is the output of conductivity sensor and PH sensor?   3
1,why we use 4-20 ma output of all instrument qhy not use 0- 20, 2,what is the different between PLC & DCS. 3,how can we meaure maximum span of new flowmeter if not given any information. Reliance 4
how can check the loopchecking for valves?   3
 
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