Siemens Simatic S7-300 Technical Data Manual page 186

Technical data of CPU 31x
7.5 CPU 315-2 PN/DP
Technical data
IEC Timers
•
•
Data areas and their retentivity
Flag bits
•
•
Clock flag bits
Data blocks
•
•
•
Local data per priority class
Blocks
Total
OBs
•
Nesting depth
•
•
FBs
•
•
FCs
•
•
Address areas (I/O)
Total I/O address area
Distributed
I/O process image
Digital channels
of those local
Analog channels
of those local
7-20
Type
Number
Retentive memory
Default retentivity
Number
Length
Non-Retain support (configured retention)
Length
Per priority class
additional within an error OB
Number
Length
Number
Length
Yes
SFB
Unlimited
(limited only by RAM size)
2048 bytes
Configurable
From MB0 to MB15
8 (1 byte per flag bit)
1023
(DB 1 to DB 1023)
16 KB
Yes
Max. 1024 bytes per run level / 510 bytes per
block
1024 (DBs, FCs, FBs)
The maximum number of blocks that can be
loaded may be reduced if you are using another
MMC.
See the Instruction List
16 KB
8
4
See the Instruction List
2048
(FB 0 to FB 2047)
16 KB
See the Instruction List
2048
(FC 0 to FC 2047)
16 KB
max. 2048 bytes/2048 bytes
(can be freely addressed)
max. 2000 bytes
128/128
16384/16384
Max. 1024
1024/1024
Max. 256
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05