Interesting table Jesper, haven't come across that one before. I thought the 300 CPUs only had warm restart (apart from the 318, I assume). Is there some circumstance where they can also have a cold restart (or "wiederanlauf")?
I just had a look on the Siemens Mall and found this about the 315-2 DP (I know it's irrelevant to the original question, but the subject seems to be a bit unclear!)
Zeiten/Zähler und deren Remanenz
S7-Zähler
Anzahl
256
davon remanent ohne Batterie
einstellbar
Ja
Remanenz
einstellbar
Ja
Zählbereich
einstellbar
Ja
untere Grenze
0
obere Grenze
999
IEC-Counter
vorhanden
Ja
Art
SFB
S7-Zeiten
Anzahl
256
Remanenz
einstellbar
Ja
voreingestellt
Keine Remanenz
Zeitbereich
untere Grenze
10 ms
obere Grenze
9.990 s
IEC-Timer
vorhanden
Ja
Art
SFB
Datenbereiche und deren Remanenz
Merker
Anzahl
2.048 Byte
Remanenz einstellbar
Ja; MB 0 bis MB 2047
Anzahl Taktmerker
8; 1 Merkerbyte
Datenbausteine
Anzahl, max.
1.023; von DB 1 bis DB 1023
Grösse, max.
16 KByte; Lokaldatengröße: max. 1024 Byte pro Ablaufebene/ 510 Byte pro Baustein
Lokaldaten
je Prioritätsklasse, max.
128 Byte
So according to that, S7 Timers and counters are retentive, but not IEC timers and counters(I don't think I would have expected them to be different!). Merker are explicity stated as being retentive, but funnily enough no mention of it for the DBs!
I had a look at the 317 while I was there but funnily enough they've changed the catalogue entry since I copied it in October 2003. However, then it said without any qualification:
Wartungsfreie Datensicherung;
Alle Daten werden bei Spannungsunterbrechung automatisch durch die CPU gesichert und stehen nach Einschalten der Spannung unverändert zur Verfügung.
Note - all data, no qualifications.
Funnily enough I notice on my CD-ROM catalogue (10/2003) they say of the 315-2 DP that the SF LED indicates (amongst other things) battery failure, even though there is no battery. Obviously somebody got a bit careless while updating the catalogue.
I wonder how many of the other bits of information we take as gospel is also wrong?