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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
5-40 A5E00105492-03
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Table 5-22 RS 485 repeater
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RS485 repeater 6ES7 972-0AA00-0XA0
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An RS485 repeater amplifies data signals on bus lines and interconnects bus
segments.
You require this RS485 Repeater in the following situations:
• for operation with more than 32 network nodes
• when interconnecting a grounded and an ungrounded segment
• when exceeding the maximum line length in a segment
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... can be found in the Chapter &DEOHOHQJWKV.
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If you want to implement cable lengths above those permitted in a segment, you
must use RS485 repeaters. The maximum cable length possible between two
RS485 repeaters corresponds to the cable length of a segment (see the following
Chapter). Please note that these maximum cable lengths only apply if no other
node is interconnected between the two RS485 repeaters. You can connect up to
nine RS485 repeaters in series.
Please note that you have to add the RS485 repeater when you determine the
number of nodes in your subnet, even if it is not assigned its own MPI/PROFIBUS
address.
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... in the RS485 Repeater product information.
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Table 5-23 PG patch cord
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PG patch cord 6ES7 901-4BD00-0XA0
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