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Active Contributor

Join Date: Nov 2016
Posts: 15
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Profibus DP & PA

11/22/2016 11:32 PM

Hello everybody

i have a doubt in profibus DP and profibus PA. For which instruments we can use DP and where we can use PA. like in my Plant we are using Profibus DP with flowmeters ,pressure transmitters,solenoid valves & Mov's .but for control valve they used profibus PA.my question is

why not they used the DP for all.

what happens when they will use PA for transmitters and MOV's also.

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: profibus DP & PA

11/23/2016 2:58 AM

It depends upon what is in the plant. After all, [hint] one of the two is suitable for hazardous areas, and the other is not. Time for some reading!

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Active Contributor

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#2
In reply to #1

Re: profibus DP & PA

11/23/2016 3:49 AM

PA is used in hazardius area. But in my plant there is no such area

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
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#3
In reply to #2

Re: profibus DP & PA

11/23/2016 4:36 AM

No-one else on this forum can see that; <...we...> - as there are others at the facility, ask "them". After all, it had to be designed, installed and commissioned, and therefore there will be local records of who did what, why, where, and when.

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Guru

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#4

Re: Profibus DP & PA

11/23/2016 10:37 AM

DP runs over RS-485, which is not suitable for hazardous areas.

PA is specifically for field instruments in hazardous areas.

PA uses

- intrinsically safe transmission techniques,
- field devices are powered over the bus cable,
- reliable data transmission (at a lower baud rate than DP)

The protocol is the same for DP and PA, but the hardware tranmission layer is different.

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Active Contributor

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#5
In reply to #4

Re: Profibus DP & PA

11/23/2016 10:51 PM

It means we can use both of them in non- hazardous environment like RO plant desaination etc .

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain, and now disconnecting as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 26596
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#6
In reply to #5

Re: Profibus DP & PA

11/24/2016 3:08 AM

There's the solution, then: whoever <...we...> are, have the answers already.

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Guru

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#7
In reply to #5

Re: Profibus DP & PA

11/24/2016 1:32 PM

Yes, either DP or PA is suitable for non-hazardous area.

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