The DP/PA coupler has the following tasks:

synchronous (8 bits/character) and, associated with this, conversion of the

transmission rate from 45.45 kbit/s to 31.25 kbit/s. The DP/PA coupler

"acts as a wire"; it is not configured and cannot be detected by the stations.

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PA System Description

kinjalpatel1899

Dear All,

How can we define transfer rate for any instrument??

Suppose if i have temperature transmiiter and its signal type is profibus PA then what will be the data transfer rate for the same??

Wago

kinjalpatel1899

Dear All,

How can we define transfer rate for any instrument??

Suppose if i have temperature transmiiter and its signal type is profibus PA then what will be the data transfer rate for the same??

Hello,
Kindly find attached file.

Best regards.......

PA?

Ste39

Wago

kinjalpatel1899

Dear All,

How can we define transfer rate for any instrument??

Suppose if i have temperature transmiiter and its signal type is profibus PA then what will be the data transfer rate for the same??

Hello,
Kindly find attached file.

Best regards.......

PA?

Hello kinjalpatel;

To start you off properly on Profibus PA networking, I suggest you start with the following Siemens manual, or look up the available information of the Profibus.com/dowloadssite:

SIMATIC Field Automation with PROFIBUS in the Process Industry

PROFIBUS PA is the extension of PROFIBUS DP to include the optimized transmission system for field devices while retaining the communications function of PROFIBUS DP. With the selected transmission system, field devices, even in hazardous areas, can be connected to the automation system over great distances and powered via PROFIBUS PA. With a relatively low transmission rate of 31.25 kbit/s, the typical communication time of a transducer is only about 10 ms. This enables practically all typical applications in the process industry to be implemented with fast cycle times and in widely distributed systems. PROFIBUS PA is the communications-compatible extension of PROFIBUS DP.

To understand how Profibus-DP and Profibus PA can be bridged, there are 2 basic things you must understand:

- First, Profibus PA is not a RS-485 based (it is Machester Bus-powered, or MBP) so you need either a coupler or a link element to connect PA instruments to a DP network.

- Second, both Profibus PA and Fieldbus Foundation H1 are based on the FISCO design (Fieldbus intrinsically safe concept) that limits the power transmitted to the instruments in the field, and one of the requirements is a low bus speed on the instrument bus. Therefore the 31,5 kbps speed limit on PA networks. If you use a DP/PA coupler, the Profibus-DP network will operate at a low speed (45,45 kB for a Siemens coupler); a DP/PA link will allow more instruments (up to 5 couplers, each with its own line of instruments) and will allow the Profibus-DP side to continue working at high speeds (up top 12 MB).

So look at the proposed manual, in the chapters concerned with bus transitions, to determine whether you will require a bus coupler or a link module to connect your instrument lines to the Profibus-DP line.

Note that to calibrate and identify your instrumentsover the Profibus PA network you will require a licensed version of PDM, which you can look up here:

https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=6ES76583NX182YH5&caller=view

Hope this helps,

Daniel Chartier