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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
5-41
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If bus nodes are connected to a bus segment via stub cables (e.g. PG via a normal
PG cable), then you must consider the maximum possible length of the stub cable.
You can use a PROFIBUS bus cable with bus connector as the stub cable for up to
3 Mbps.
Use the patch cord to connect the PG or PC when operating above 3 Mbps. In your
bus configuration you can use multiple PG patch cords with this order no. Do not
use other types of stub cable.
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You can implement cable lengths of up to 50 m in an MPI subnet segment. This
50 m applies from the first node to the last node in the segment.
Table 5-24 Permitted cable lengths in an MPI subnet segment
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19.2 kbps
187.5 kbps
50 m 1,000 m
1.5 Mbps M 200
3.0 Mbps
6.0 Mbps
12.0 Mbps
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M 100
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The cable length in a segment of a PROFIBUS subnet depends on the
transmission rate.
Table 5-25 Permitted cable lengths in a PROFIBUS subnet segment
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9.6 kbps to 187.5 kbps 1,000 m
500 kbps M 400
1.5 Mbps M 200
3 Mbps to 12 Mbps M 100
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