Logix 5 K File Extensions

[The Plc Kid]

What are the .SEM and .WRK file extensions for? I see them along with saved project files sometimes. Why are they created on some project saves and not others?

 

[bkottaras]

Not exactly sure about the extensions but they are ""live" files.
They open up automatically when you work with RSL5K and disappear when you close the actual RSL5K software.
I have some as well but because the PC had to be rebooted and the RSL5K was never closed prior to the reboot.
Probably a scratch pad of sorts.

 

[bernie_carlton]

Knowledgebase number 28928 - but a Techconnect is required. I can't figure out why, but bkottaras is essentially correct.

 

[shredder]

SEM and WRK have zero size anyways and are temporary (swap?) files, you need only ACD.

 

[daba]

It was always my understanding, (and I may be wrong), that these files were there to prevent two users opening the same project from the same source.

I have never seen them any size other than 0 length, so am dubious as to their use as "swap" files, but then i've never monitored them while "working" with RSLogix5000.

Anyway, if RSLogix5000 is not running, and there is no possibility of another (networked) PC having the file open, then it is safe to delete them. They will get left behind if RSLogix5000 is terminated abnormally, or power is pulled on the PC. The next normal closure of a project will delete them anyway, so it's probably not even worth worrying about them.