Siemens Simatic S7-300 Specifications Page 19

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
A5E00105475-03
3-3
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Table 3-1 Differences amongst the CPUs 31xC
9-pin DP
interface (X2)
X X
15-pin PtP
interface (X2)
X X
Digital inputs 10 24 16 16 24 24
Digital
outputs
6 16 16 16 16 16
Analog inputs 4 + 1 4 + 1 4 + 1
Analog
outputs
2 2 2
Technological
functions
2 counters 3 counters 3 counters 3 counters 4 counters
1 Channel for
positioning
4 counters
1 Channel for
positioning
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The CPU is equipped with following LED displays:
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SF red Hardware or software error
BF
(only for CPUs with
DP interface)
red Bus error
5 VDC green 5V power for CPU and S7-300 bus is OK
FRCE yellow Force job is active
RUN mode green CPU in RUN
The LED blinks at startup with 2 Hz, in pause with 0.5
Hz.
STOP yellow CPU in STOP and PAUSE or startup
The LED blinks for reset request with 0.5 Hz, during
the reset with 2 Hz.
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