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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
 
when we are using HART COMMUNICATOR why we are using 250 ohm resistance while using HART COMMUNICATOR.   6
without color coding, without nameplate, without multimeter how can you find the type of thermocouple??? SABIC 1
On liquid service if PT Head is 18 meters. How much pressure will be exerted on it. If Transmitter is not in service?   1
what is difference between positioner and position transmitter in control valve   1
A pressure Tx accuracy is 0.2%. Signal o/p is 4-20ma.span is 16 Ma.how many deviate the o/p then calibration needed   1
how the presure switches are calibrated? and what happen inside?   1
A pressure transmitter with a range of 0-100 bar.The accuracy of the instrument is 1% of upper range value? The pressure indicating transmitter is showing the system pressure is 50 bar. b. When you include the error, what is the minimum possible pressure in our fuel gas system? i. 49.5 bar ii. 49 bar iii. 1 bar iv. 0.5 bar We want to change the filter cartridge. We must depressure the fuel gas system. c. After we depressure the system in preparation for maintenance, the transmitter displays a pressure of +0.1 bar. At this time, what is the possible range of pressures in our fuel system? i. +0.099 to +0.101 bar ii. 0 to +0.2 bar iii. -0.1 to +0.3 bar iv. -0.9 to +1.1 bar   3
what is modbus?and why use it?what benifit   2
how many types of sensor in instrumentation SRACO 1
list of flame proof certification ? TATA 1
how to calibrate an error for pressure transmitter, make it easy to understand descon 1
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
 
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