Siemens S7-300 appendix Technical data Timers/counters and their retentivity

Technical data of CPU 31xC 6.3 CPU 313C

Technical data

Timers/counters and their retentivity

S7 counters		256
•	Retentive memory	Configurable
•	Default	from C0 to C7
•	Counting range	0 to 999
IEC Counters		Yes
•	Type	SFB
•	Number	unlimited (limited only by RAM size)
S7 timers		256
•	Retentive memory	Configurable
•	Default	Not retentive
•	Timer range	10 ms to 9990 s
IEC Timers		Yes
•	Type	SFB
•	Number	unlimited (limited only by RAM size)
Data areas and their retentivity
Flag bits		256 bytes
•	Retentive memory	Configurable
•	Default retentivity	MB0 to MB15
Clock flag bits		8 (1 byte per flag bit)
Data blocks		Max. 511
		(DB 1 to DB 511)
•	Length	max. 16 KB
Local data per priority class		max. 510 bytes
Blocks
Total		1024 (DBs, FCs, FBs)
		The maximum number of blocks that can be
		loaded may be reduced if you are using another
		MMC.
OBs		see the Instruction List
•	Length	max. 16 KB
Nesting depth
•	Per priority class	8
• additional within an error OB		4
FBs		Max. 512
		(FB 0 to FB 511)
•	Length	max. 16 KB
FCs		Max. 512
		(FC 0 to FC 511)
•	Length	max. 16 KB

CPU 31xC and CPU 31x, Technical data	6-9
Manual, Edition 08/2004, A5E00105475-05