Siemens CPU 31 Series Technical Data Manual page 193

Technical Data
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IEC Counters
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S7 timers
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IEC Timers
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Data areas and their retentivity
Flag bits
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Clock flag bits
Data blocks
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Local data per priority class
Blocks
Total
OBs
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Nesting depth
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FBs
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CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
Retentive memory
Default
Counting range
Type
Number
Retentive memory
Default
Timer range
Type
Number
Retentive memory
Default retentivity
Number
Size
Non-Retain support (configured retention)
Size
Per priority class
additional within an error OB
Number, Max.
Size
Technical data of CPU 31x
Configurable
from C0 to C7
0 to 999
Yes
SFB
Unlimited
(limited only by work memory)
512
Configurable
Not retentive
10 ms to 9990 s
Yes
SFB
Unlimited
(limited only by work memory)
4096 bytes
Configurable
From MB0 to MB15
8 (1 byte per flag bit)
2047
(in the 1 to 2047 range of numbers)
64 KB
Yes
Max. 1024 bytes
2048 (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
64 KB
16
4
See the Instruction List
2048
(in the 0 to 2047 range of numbers)
64 KB
7.6 CPU 317-2 DP
7-27