Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 193)

Technical data of CPU 31x
7.6 CPU 317-2 DP
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
7-27
Technical data
Timers/counters and their retentivity
S7 counters
512
• 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 512
• 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
4096 bytes
• Retentive memory Configurable
• Default retentivity From MB0 to MB15
Clock flag bits 8 (1 byte per flag bit)
Data blocks
•
Number 2047
(DB 1 to DB 2047)
• Length 64 KB
• Non-Retain support (configured retention) Yes
Local data per priority class max. 1024 bytes
Blocks
Total
2048 (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 64 KB
Nesting depth
• Per priority class 16
• additional within an error OB 4
FBs See the Instruction List
• Number 2048
(FB 0 to FB 2047)
• Length 64 KB