Hi,

According to chapter 12.2 of the manualthe clock is buffered for aproxx. 6 weeks.

About the "retentive alarm buffer" as you mentioned, I found here some more information. It says e.g. "The devices possess a zero-voltage-safe (non-volatile), maintenance-free alarm buffer".

I guess the panel saves the information in the same way as the S7-300 CPUs do, putting it into (flash) memory when the capacitor is getting to weak.

forgive my poor English,

I just found what "Bridging time" really mean!
Do you mean in about 6 weeks thehyper capacity can provide the power theRAM and Clock CHIP needed, but after 6 weeks, the msg is stored in the flash and the clock is no longer retained because of there is no power provided?

thank you Smurf!

Hi,

What I mean is that the clock is buffered for about 6 weeks (according to the manual). This period of aprox. 6 weekshas nothing to do with the retentive buffer for the messages, it could be, but it is not necessary.

How the buffering procedure in the panel itself works I don't know, but when Siemens says it it is maintenance-free this retentive memeory must be somewhere in the panel is a special place.