Siemens Simatic S7-300 Technical Data Manual page 175

Technical data
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
I/O process image
Digital channels
of those local
Analog channels
of those local
Assembly
Racks
Modules per rack
Number of DP masters
•
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
Retentive memory
Default retentivity
Number
Length
Length
Per priority class
additional within an error OB
Number
Length
Number
Length
Integrated
via CP
Technical data of CPU 31x
256 bytes
Yes
MB0 to MB15
8 (1 byte per flag bit)
511
(DB 1 to DB 511)
16 KB
Max. 510
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
512
(FB 0 to FB 511)
16 KB
See the Instruction List
512
(FC 0 to FC 511)
16 KB
Max. 1024 bytes/1024 bytes (can be freely
addressed)
128 bytes/128 bytes
Max. 1024
Max. 1024
Max. 256
Max. 256
Max. 4
8
None
Max. 1
7.3 CPU 314
7-9