# PROFIBUS PA

Protocols · `PROFIBUS PA` · verification: source checked

PROFIBUS PA is the process automation application profile of PROFIBUS, used to connect process field devices on a fieldbus. PA segments connect to PROFIBUS DP through a coupler or linking device, and can also connect directly to PROFINET using proxy technology. PA Profile V3.02 allows a replacement device to take over the predecessor's role without interrupting system operation.

## Specification

| Property | Value |
|---|---|
| Transports | other |
| Architecture | master slave |
| Encoding | binary |
| Standard body | PROFIBUS & PROFINET International (PI) |
| Standard ref | IEC 61158 |

## Connected

- Related: [PROFINET](https://machineschema.com/protocol/profinet.md)

## Safety

- PROFIBUS PA applications can be deployed in hazardous environments.

## Study notes

- PROFIBUS is standardized in IEC 61158.
- PROFIBUS PA Profile V3.02 lets a replacement field device automatically take over the role of its predecessor, including across device generations, without interrupting system operation.
- A PROFIBUS PA string connects to PROFIBUS DP through a coupler or linking device.
- PA segments can be connected directly to PROFINET using proxy technology.
- Diagnostic data display is sorted according to NAMUR NE 107.
- MBP (Manchester Coded Bus Powered) transmission technology provides a typical supply current of 10–15 mA on the bus cable for bus-powered field devices.
- PA Profile 3.02 includes a NAMUR-compliant diagnostics concept.

## Sources

1. [PROFIBUS](https://www.profibus.com/technologies/profibus) (accessed 2026-10-25)
2. [PA-DIM](https://www.profibus.com/technologies/profinet/information-models/pa-dim) (accessed 2026-10-25)

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Source page: https://machineschema.com/protocol/profibus-pa  
JSON: https://machineschema.com/protocol/profibus-pa.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.