At this moment i'm logging alarms in a file on the plc

but I want to limit the maximum file size
to avoid the problem that the plc runs out of disk space
So when the file reaches the maximum file size and I want to apend a new text line to the file I want also
remove the oldest (first text line in the file ), first in first out principle
Is this posible ??

And can sombody give me a hint

kind regards

Merlijn

two ways to do this.
make a file and when reaching max size start another file, when this reaches the end start filling file 1 again.

another way is by removing last line while copying and adding first line.
this means always diskactivity.

hello Shooter

I solved the problem

first i scan the directory and save from all file's in that directory the name, creation date and the size in a array
and find out witch file is the newest and witch file is the oldest and how big the directory is
then i check or the newest file is bigger then the maximum size set
if that is the case i create a new file with a name based on the system time Example ( 2013-08-08-09-47-25.log )
after that i check or the directory has reached the maximum size set ithat is the case
I will delete the oldest files

to do this i use the library's syslibfile.lib and the library syslibdir.lib

but thanks for your support