Two files are saved in the specified folder:
autoexec.fp7: compiled program code executable by the FP7
autoexec.pce: back-up file of the project that contains variable names, comments of the editors, POU names, etc.
The PLC will only detect the auto execution file if it is located in an SD card folder named "\AUTO"! You can append the 'AUTO' folder automatically.
Installing an SD card
Executing projects from an SD card