Difference between Profibus DP/PA?what does it stand for and
how is it use in process?
- 1 Answers
- 21503 Views
- I also Faced
- E-Mail Answers
Answer Posted / a.naresh
PROFIBUS is a vendor-independent open bus system. It has three types namely:
1.PROFIBUS-FMS (Fieldbus Message Specification
2.PROFIBUS-DP (Decentralized Periphery)
3.PROFIBUS-PA (Process Automation).
## The DP variant (decentralized periphery) is the high-speed solution of PROFIBUS. It has been designed and optimized especially for communication between automation systems and decentralized field devices. Therefore,PROFIBUS-DP requires less than 2 ms for the transmission of 1 Kbyte of input and output data. In this way even extremely time-critical communication tasks can be solved.PROFIBUS-DP communicates via cyclic data traffic exclusively.Each field device exchanges its input and output data with the automation device,within a given cycle time.
##In process engineering as well as in process automation,operation and monitoring tasks require a visualization device in addition to the automation device. This class-2 master is responsible for the various
start-up, parameterization and monitoring functions of up-to-date field devices.They require that device data be read or written during operation independent of the control cycle.
PROFIBUS-PA meets these special requirements of process automation.
The important characteristics of profibus PA are:
->intrinsically safe transmission techniques.
->field devices are powered over the bus cable,
->reliable data transmission, and
->interoperability (standardization of device functions).
| Is This Answer Correct ? | 19 Yes | 5 No |
Post New Answer View All Answers
why connecting surge unit in contactor coil
The ripple frequency in output of fullwave bridge rectifier is a. Half the input b. Twice the input c. Same as input
RATING OF LIGHTENING ARRESTER FOR 11 KV LINE IS 9 KV is ok ,but haw to calculate the KA rating?
What is formula calculation size cable wire ?
hello everybody. what does an abnormal stator winding impedance or dc resistance show? thanx
Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0
How relay works, reverse relay, master relay, os relay, earth fault relay and what is its setting point
How much inductance or resistance require as a starter in series with induction motor of specific capacity(e.g. 5 hp) ? What is formula for it ?
What does the kvar means?
WHAT IS MEANT BY OVER EXCITATION IN GENERATOR TRANSFORMERS? DESCRIBE IT.
TRAFO 1. WHY BREATHER IS USED. 2. WHY OIL GOES DOWN IN CONSERVATOR TANK. 3. WHY WE ARE TAKING OIL SAMPLE TAKING FROM BOTTOM OF TRANSFORMER. 4. HOW TO CHECK IR VALUE OF TRANSFORMER. 5. WHY OLTC HAVING BUCHHOLZ TRIP ONLY; WHY NO ALARM. 6. OFF LOAD TAP CHANGER OPERATION PROCEDURE. 7. TR. SHUTDOWN / ISOLATION PROCEDURE. 8. WHEN THREE TRS. IN PARALLEL, ONE TR. IS NOT SHARING THE LOAD – WHAT IS REASON AND WHAT YOU WILL DO. 9. WHY TR. HAS OLTC IN HV SIDE. 10. WHAT IS % IMPEDANCE. 11. WHY TR. RATING IN MVA. 12. WHAT IS VECTOR GROUP IN TR. 13. CONDITION FOR PARALLEL OPERATION OF TRS. 14. WHAT IS TERTIARY WINDING. WHERE IT WILL BE. 15. IF TR. TRIP ON BUCHHOLZ OR TAP CHANGER RELAY, WHAT YOU WILL DO. 16. DIFFERENCE BETWEEN OIL TEMP. AND WINDING TEMP. PROTECTION 17. HOW WINDING TEMP. IS MEASURED IN CAST RESIN TR. 18. DIFFERENT TYPES OF FAULTS IN TR. Trafo - Page-1 of 2 19. WHAT HAPPENS WHEN TR. CHARGED FROM LV. 20. WHAT WILL YOU DO IF MEGGER READING SHOWS ZERO BETWEEN LV WINDING AND EARTH. 21. CAN WE INTERCHANGE BUCHHOLZ RELAY OF MAIN TANK AND OLTC TANK. 22. IF THE LINE BETWEEN BREATHER AND CONSERVATOR TANK 23. LOCKED, WHAT WILL HAPPEN DURING LOAD CYCLE. 24. WHAT IS THE FUNCTION OF OIL SEAL IN BREATHER. 25. WHAT ARE LOCATIONS FOR BUCHHOLZ RELAY FIXED IN POWER TR. 26. WHAT ARE CHECKS IN POWER TR. DURING MAINTENANCE. 27. WHAT IS IMPORTANT WHEN WE CHECK OLTC OPERATION DURING MAINTENANCE. Trafo - Page 2 of 2
Does magnetomonopoles exists? one maxwell equation strongly suggests no, but how about their existance in plasma?
pls tell us AC plant are how do work and parts name with picture
What types of high speed CMOS circuits have you designed?
is it true there's a big difference in using Cummins or Denyo...especially power output or leakage
