Siemens Simatic S7-300 Technical Data Manual page 119

Technical data
Timers/counters and their retentivity
S7 counters
•
•
•
IEC Counters
•
•
S7 timers
•
•
•
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
•
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
Retentive memory
Default
Counting range
Type
Number
Retentive memory
Default
Timer range
Type
Number
Retentive memory
Default retentivity
Length
Length
Per priority class
additional within an error OB
Length
Length
Technical data of CPU 31xC
256
Configurable
from C0 to C7
0 to 999
Yes
SFB
unlimited (limited only by RAM size)
256
Configurable
Not retentive
10 ms to 9990 s
Yes
SFB
unlimited (limited only by RAM size)
256 bytes
Configurable
MB0 to MB15
8 (1 byte per flag bit)
Max. 511
(DB 1 to DB 511)
max. 16 KB
max. 510 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
6.3 CPU 313C
6-9