modbus and profibus communication difference?

Answer Posted / jignesh patel(abb)

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 ?    18 Yes 4 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

how to work static pressure sensore how to work dpt

1391


What is zener diode? What is voltage regulator?

633


Pressure tx shows 1 mbar but we need 1000 mbar at this process condition .. how can we sort it out .

1179


how u choose thermowell lenght n pnumatic C/v size?

1655


Why all the drains(Gland sealing,ESV,Casing inlet etc) are directly connected to the flash tank instead of hotwell of the condensor in the power plant? My Email Id:naba02222@gmail.com

1849






Where are oxygen analysers installed in cfbc boilers? What are their usual readings?

1112


what can of fault ofently come in vibration mesurement?

1666


Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

1640


where i can get training in INTOOLS and PDMS in Delhi-NCR OR north part of India. please reply with ur ans. at arunsamkaria@ymail.com

3050


who's take first position in process in the timing of new installation flow transmitter and control vavle. give the answer with logical trick.

4234


POSSITIVE PULSE IS APPLIED TO AN INVERTER INPUT.THE TIME FROM THE LEADING EDGE OF THE INPUT TO THE LEADING EDGE OF THE OUTPUT IS 10 ns. THE TIME FROM THE TRAILING EDGE OF THE INPUT TO THE TRYLING EDGE OF THE OUTPUT IS 8 ns. WHAT ARE THE VALUES OF tPLH and tPHL?

1747


what are the selections available in configuring a burnout protection of a controller? thanks

1441


how u calibrate sox nox co2 co in cemps?what is opacity n HPm?tell the standard parameters of cems?

3181


How is flow measured in square root?

668


the pump holds on run indication into the dcs and filed local control panel remote push button condition operaton wrong like when the push button pushing conditions the pump is off and the push button release condition the pump is on totally opposite condition . And control room inside give the stop command into dcs just 1secon relay engage and again normal condition. How can I slove

1122