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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
5-42 A5E00105492-03
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If you want to implement cable lengths above those permitted in a segment, you
must use RS485 repeaters. Information on this topic can be found in the
RS485 repeater product information.
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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.
The following table lists the maximum permitted lengths of stub cables per
segment:
Table 5-26 Stub cable lengths per segment
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9.6 kbps to 93.75
kbps
M 96 32 32
187.5 kbps M 75 32 25
500 kbps M 30 20 10
1.5 Mbps M 10 6 3
3 Mbps to 12 Mbps
1) 1) 1)
1)
At 3 Mbps and higher, use the PG patch cord (Order No. 6ES7 901-4BD00-0XA0) to
connect the PG or PC. You can use multiple PG patch cords of this number in an
installation. Do not use any other type of stub cable.
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