Siemens Simatic S7-300 Technical Data Manual page 114

Technical data of CPU 31xC
6.2 CPU 312C
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
I/O process image
Digital channels
•
•
Analog channels
•
•
6-4
Type
Number
Retentive memory
Default retentivity
Length
Length
Per priority class
additional within an error OB
Length
Length
of those local
Integrated channels
of those local
Integrated channels
Yes
SFB
unlimited (limited only by RAM size)
128 bytes
Configurable
MB0 to MB15
8 (1 byte per flag bit)
Max. 511
(DB 1 to DB 511)
max. 16 KB
max. 256 bytes
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
max. 16 KB
8
4
Max. 512
(FB 0 to FB 511)
max. 16 KB
Max. 512
(FC 0 to FC 511)
max. 16 KB
max. 1024 bytes/1024 bytes
(can be freely addressed)
128 bytes/128 bytes
Max. 256
Max. 256
10 DI / 6 DO
Max. 64
Max. 64
None
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05