Answer / 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).

how to calculate the KVAr for an motor for improving the PF

3 Answers  

---

how to calculate slip ring induction motor stator and rotor currents??

0 Answers  

---

How many battery required for an 3kva online ups with 3 hrs back up with usage of 3 fans,3tube lights

1 Answers  

---

How do we find the rating of a transformer, if it got burnt badly.

0 Answers  

---

what is the difference between dropout fuse and horn gap fuse. how to choose between them

1 Answers  

---

What happened when we give 2 phase supply to a 1 phase equimpent. It's effect on equipment's efficiency and life?

5 Answers  

---

what happen for input voltage output voltage input current output current and kva if we increase primery winding in transformer?

1 Answers  

---

difference between isolater and circuit breaker?

7 Answers   Adani,

---

IN 3 phase induction motor where we give i/p supply & how its working ?

2 Answers  

---

Why does the power consumed is always constant even if a fan speed is altered?

5 Answers  

---

What is the difference between magnetic loading and electric loading of a machine?

2 Answers  

---

What is maximum AC & DC transmission voltage in India? and where?

12 Answers  

---