Siemens Simatic S7-300 Specifications Page 104
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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
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IEC Timers Yes
• Type SFB
• Number unlimited (limited only by RAM size)
'DWDDUHDVDQGWKHLUUHWHQWLYLW\ &38&3W3 &38&'3
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 &38&3W3 &38&'3
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
$GGUHVVDUHDV,2V &38&3W3 &38&'3
Total I/O address area max. 1024 bytes/1024 bytes
(can be freely addressed)
max. 1024 bytes/1024 bytes
(can be freely addressed)
• Distributed None max. 1008 bytes
I/O process image 128 bytes/128 bytes 128 bytes/128 bytes
Digital channels max. 1008 max. 8192
• of those local max. 992 max. 992
• integrated channels 16 DI / 16 DO 16 DI / 16 DO
Analog channels max. 248 max. 512
• of those local max. 248 max. 248
• integrated channels None None
- A5E00105475-03 1
- Safety Guidelines 2
- Qualified Personnel 2
- Correct Usage 2
- Trademarks 2
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- Cycle time 53
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- Time slices (per 1 ms) 63
- Time slice (1 ms) 63
- 3URFHVVLPDJHXSGDWH 64
- + 60 µs per rack 65
- • Communications 66
- VHHDOVR 67
- 2YHUYLHZ 68
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- • I/O delay 83
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- &38& 137
- CPU Interface 138
- Standard 139
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- 1 averaged measuring value 145
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- • flag bits 182
- • S7 timers 182
- • S7 counters 182
- • Data areas 182
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