Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 180)

Technical data of CPU 31x
7.4 CPU 315-2 DP
CPU 31xC and CPU 31x, Technical data
7-14
Manual, Edition 08/2004, A5E00105475-05
Technical data
Data areas and their retentivity
Flag bits
2048 bytes
• Retentive memory Yes
• Default retentivity MB0 to MB15
Clock flag bits 8 (1 byte per flag bit)
Data blocks
• Number 1023
(DB 1 to DB 1023)
• Length 16 KB
Local data capacity Max. 1024 bytes per task/510 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
I/O process image 128/128
Digital channels Max. 16384
of those local Max. 1024
Analog channels Max. 1024
of those local Max. 256
Assembly
Racks
Max. 4
Modules per rack 8
Number of DP masters
• Integrated 1
• via CP 1