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# PROFINET CBA (PN-CBA)
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The PROFINET CBA (PN-CBA) protocol is a field bus protocol related to platform independent data exchange.
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PN-CBA is based on [DCOM](/DCOM) and the "lightweight" [PROFINET/RT](/PROFINET/RT) ([Ethernet](/Ethernet) type 0x8892) protocols:
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- The connection management part is using [DCOM](/DCOM) as its underlying protocol.
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- The acyclic data transfer (transfer of data if value changed) also uses the [DCOM](/DCOM) protocol.
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- The cyclic data transfer uses the "lightweight" [PROFINET/RT](/PROFINET/RT) protocol.
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## History
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XXX - add a brief description of PROFINET CBA history
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## Protocol dependencies
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- [DCOM](/DCOM): PN-CBA uses [DCOM](/DCOM) as its transport protocol.
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- [PROFINET/RT](/PROFINET/RT): PN-CBA uses [PROFINET/RT](/PROFINET/RT) as its cyclic data transport protocol.
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## Example traffic
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XXX - Add example traffic here (as plain text or Wireshark screenshot).
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## Wireshark
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The PN-CBA dissector is fully functional.
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## Preference Settings
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There are no PN-CBA specific preference settings.
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## Example capture file
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XXX - Add a simple example capture file to the [SampleCaptures](/SampleCaptures) page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.
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## Display Filter
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PN-CBA splits into several [DCOM](/DCOM) interfaces, so there's no single PN-CBA filter available. A complete list of PN-CBA display filter fields can be found in the [display filter reference](http://www.wireshark.org/docs/dfref/#section_c), look for all protocols (DCOM interfaces) beginning with the *cba\_* prefix there.
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For this reason, theres no simple PN-CBA filter. However, you can filter on the underlying [DCOM](/DCOM) protocol.
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Show only the DCOM (PN-CBA) based traffic:
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```
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dcom
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```
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## Capture Filter
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You cannot directly filter PN-CBA protocols while capturing.
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## External links
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- the *PROFINET CBA Architecture Description and Specification* can be found at <http://www.profibus.com> -\> *downloads* -\> *specifications and standards*
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- add link where to find additional info on the web about PN-CBA
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## Discussion
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---
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Imported from https://wiki.wireshark.org/PROFINET/CBA on 2020-08-11 23:18:21 UTC |