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  1. gian.flores
  2. PLCnext Technology & PLCnext Controls
  3. Wednesday, 10 March 2021
I am trying to save the retain data on the plc. Here are the steps I followed.
1. Enable retain on several variables.
2. Go to cockpit and save the retain data.
3. According to the manual a prb file is saved.
4. I connected to winscp and look for *.prb file. It does not exist. Where is it located?
5. Stop the controller.
6. Restore last saved data button is enabled. This tells me the retain data from step 2 worked but I couldn't find it anywhere in the plc (prb file(s)).
7. According to the manual, the plc is able to save up to 10 retain data. If I am able to save 10 retain data, how can I tell the PLC to load a specific one? How does it know which retain data to load if there are 10.
Eduard PLCnext Team Accepted Answer Pending Moderation
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Hello gian.flores,

The PRB file is saved in the / opt / plcnext / retaining / backups folder.

I will provide your question on point 7 to the responsible team and give you an answer as soon as I have it.

Regards,
Eduard
Phoenix Contact Electronics Headquarter - PLCnext Runtime Product Management and Support
gian.flores Accepted Answer Pending Moderation
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Hello Eduard,

I went to the folder and the files does not have extension prb. All three files actually does not have any extension at all. Is there supposed to be a *.prb file in this folder?
Eduard PLCnext Team Accepted Answer Pending Moderation
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Hello gian.flores,

I have provided your question to development, please find the answers below:

- The backup file has no extension (* .prb in the documentation is therefore not correct and will be corrected)
- The files in the retaining / backup folder contain the backup including binary data from the retain memory I.e. is not readable by user
- Only the latest stand can be read back via the PnE. The PnE takes the file with the latest date in its name. The user can adapt the name to a more recent date.

If you have additionally questions, please don't hesitate to ask!

Best Regards
Eduard
Phoenix Contact Electronics Headquarter - PLCnext Runtime Product Management and Support
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