diagnostics buffer

hi all
can i do diagnostics buffer with out password ?

if the programer make a time to stop the working of my system will it cause SF and BF-PN leds to become red light? and if taht happend can i reset it and make my system work without password ?

the system was working the last year and now when trying to operate it no thing working

my plc show that

sf on
BF-PN flash
MT of
ON on
force of
RUN on
stop of

Hello,
If the plc project is password protected , the diagnostic buffer is invisible.
If the programmer do something wrong in the software, can cause the red LED SF.
The BF-PN can be caused by lack of the nodes already programmed in the hardware config , but not present.

Regards.