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

Technical data of CPU 31x 7.6 CPU 317-2 DP

Technical data

Timers/counters and their retentivity

S7 counters		512
•	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		512
•	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		4096 bytes
•	Retentive memory	Configurable
•	Default retentivity	From MB0 to MB15
Clock flag bits		8 (1 byte per flag bit)
Data blocks
•	Number	2047
		(DB 1 to DB 2047)
•	Length	64 KB
• Non-Retain support (configured retention)		Yes
Local data per priority class		max. 1024 bytes
Blocks
Total		2048 (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	64 KB
Nesting depth
•	Per priority class	16
• additional within an error OB		4
FBs		See the Instruction List
•	Number	2048
		(FB 0 to FB 2047)
•	Length	64 KB

CPU 31xC and CPU 31x, Technical data	7-27
Manual, Edition 08/2004, A5E00105475-05