Switch Off CPU Memorizing

Hi,

i need to record last activity ddmmyy hhmmss of a cpu to know how much time is passed when i restart (i mean giving feed supply, non a simply stop of the cpu) an put this in a DTL db.

cause if the control panel stay off for some days i need to make a safety block on next startup before start the engine again is it possible? or the fall of supply is too much fast?

tnx

Hi, tnx for the answer.

i'm a rookie and not so smart with siemens. i made a positive edge with a periodi clock but when i restart the cpu i overwritten the same field. i i loose the correct data

i put another OB? or i can use the Main?

another question is if the cpu restart, the walue won't be rewritten in the same area? 

tnx

andrea 

Ok OB100 on start up you mean.

tnx

i try

Tnx ,

now it works.

tnx a lot 

andrea