Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 119)

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