Siemens S7-300 appendix Technical data

Technical data of CPU 31x 7.5 CPU 315-2 PN/DP

Technical data

IEC Timers		Yes
•	Type	SFB
•	Number	Unlimited
		(limited only by RAM size)
Data areas and their retentivity
Flag bits		2048 bytes
•	Retentive memory	Configurable
•	Default retentivity	From MB0 to MB15
Clock flag bits		8 (1 byte per flag bit)
Data blocks
•	Number	1023
		(DB 1 to DB 1023)
•	Length	16 KB
• Non-Retain support (configured retention)		Yes
Local data per priority class		Max. 1024 bytes per run level / 510 bytes per
		block
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	16 KB
Nesting depth
•	Per priority class	8
• additional within an error OB		4
FBs		See the Instruction List
•	Number	2048
		(FB 0 to FB 2047)
•	Length	16 KB
FCs		See the Instruction List
•	Number	2048
		(FC 0 to FC 2047)
•	Length	16 KB
Address areas (I/O)
Total I/O address area		max. 2048 bytes/2048 bytes
		(can be freely addressed)
Distributed		max. 2000 bytes
I/O process image		128/128
Digital channels		16384/16384
of those local		Max. 1024
Analog channels		1024/1024
of those local		Max. 256

7-20	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05