Technical data of CPU 31xC
6.3 CPU 313C
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
6-9
Technical data
Timers/counters and their retentivity
S7 counters 256
• Retentive memory
Configurable
• Default
from C0 to C7
• Counting range
0 to 999
IEC Counters Yes
• Type
SFB
• Number
unlimited (limited only by RAM size)
S7 timers 256
• Retentive memory
Configurable
• Default
Not retentive
• Timer range
10 ms to 9990 s
IEC Timers Yes
• Type
SFB
• Number
unlimited (limited only by RAM size)
Data areas and their retentivity
Flag bits 256 bytes
• Retentive memory
Configurable
• Default retentivity
MB0 to MB15
Clock flag bits 8 (1 byte per flag bit)
Data blocks Max. 511
(DB 1 to DB 511)
• Length
max. 16 KB
Local data per priority class max. 510 bytes
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
max. 16 KB
Nesting depth
• Per priority class
8
• additional within an error OB
4
FBs Max. 512
(FB 0 to FB 511)
• Length
max. 16 KB
FCs Max. 512
(FC 0 to FC 511)
• Length
max. 16 KB
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