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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
 
units of pressure,flow, level,temperature? principle of pressure gauge? calibration of pressure tx., level tx., temperature tx.flow tx.? description of two wire ,three wire and four wire R.T.D.? WHAT IS INPUT AND OUTPUT OF TX.? WHAT IS INPUT AND OUTPUT OF R.T.D. AND THERMOCOUPLE? WHAT IS HOT LOOP AND COLD LOOP? WHAT IS INPUT AND OUT PUT AND OUTPUT OF D.C.S. AND P.L.C.? PRINCIPLE AND WORKING OF HART? WHAT IS PNP AND NPN PROXY? CALIBRATION OF PRESSURE ,LEVEL ,FLOW SWITCH? DESCRIPTION OF FIELDBUS FOUNDATION? WORKING OF SOV.?   2
WHY WE NOT USE 2-20mA,1-20mA,3-20mA or 10-50mA SIGNAL? INSTEAD OF 4-20mA. Hindustan-Unilever-Limited 6
Induction type 1-p wattmeter reads .. a) true value b) apparent value c)volt ampere value Engineers-India-Limited 3
what is upstream and downstream in liquid flow? thermax 6
Hi friends, from Aug 4th onwards iam getting spikes for analog inputs in our DCS for a period of 800ms. I throughly checked every thing, finally i found that the DI, DO's from MCC panels shields are terminated in the Signal Earth where Analog Input signals shields are terminated. Is there any problem with this type of termination?. i checked the induction voltage from MCC and getting around 25VAC, please suggest me in this concern. Our plant is 8months old only. DCS is Siemens Make Simatic PCS7, and the transmitters are Yokogawa make.   1
Reasons for using current as signal   1
What is difference between reset and initialization in industrial automation? Marafiq 1
Can someone give a detailed chart on the temperature ranges which can be measured by various temperature sensors.   3
What is the difference between Pressure Safety Valve and Pressure Relieve Valve, in what condition we prefer choose Pressure Safety Valve rather than Pressure Relieve Valve? and vice versa Vedanta 2
Determine the manipulated variable, controlled variable, and the measured variable given a description of various typical industrial processes. Honeywell 5
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why used three wire in RTD. BARC 8
 
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