Siemens Simatic S7-300 Specifications Page 98

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
6-14 A5E00105475-03
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IEC Timers Yes
Type SFB
Number unlimited (limited only by RAM size)
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flag bits 256 bytes
Retentive memory Configurable
Retentivity is default setting MB0 to MB15
Clock memory bits 8 (1 byte per memory bit)
Data blocks max. 511
(DB 1 to DB 511)
Size max. 16 KB
Local data per priority class max. 510 bytes
%ORFNV
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
Size max. 16 KB
Nesting depth
per priority class 8
additional within an error OB 4
FBs max. 512
(FB 0 to FB 511)
Size max. 16 KB
FCs max. 512
(FC 0 to FC 511)
Size max. 16 KB
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Total I/O address area max. 1024 bytes/1024 bytes
(can be freely addressed)
I/O process image 128 bytes/128 bytes
Digital channels max. 1016
of those local max. 992
integrated channels 24 DI / 16 DO
Analog channels max. 253
of those local max. 248
integrated channels 4 + 1 AI / 2 AO
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