Siemens SIMATIC C7-626, Installation, Assembly, Wiring

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3
3-6
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
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If you are operating more than 32 nodes in a network, you must link the
bus segments via RS 485 repeaters.
In a PROFIBUS-DP network, all of the bus segments together must have
at least one DP master and one DP slave.
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Ungrounded bus segments and grounded bus segments are connected via
RS 485 repeaters.
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Each RS 485 repeater used reduces the maximum number of nodes per
bus segment. This means, if there is an RS 485 repeater in a bus segment,
there can then only be a maximum of 31 further nodes in the bus segment.
The number of RS 485 repeaters has no effect on the maximum number
of nodes on the bus.
There can be up to 10 segments in one row.
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Switch the terminating resistance on at the geographical end point of the
network (see Section 3.3).
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Before you insert a new node into the network, you must switch off the
supply voltage.
Configuring MPI Networks and PROFIBUS-DP Networks