Installation guide

30 Introducing the Modbus Plus Network
890 USE 100 00
1.1 1.2 Using RR85 Repeaters
If your network requires more than 1500 ft (450 m) of cable, or more
than 32 nodes, you can install RR85 Repeaters to expand the network.
The repeaters must be sited so that no single section of the network
exceeds the maximum length of 1500 ft (450 m) of cable, and no single
section contains more than 32 nodes.
Up to three repeaters can be present in the cable path between any two
nodes that will communicate with each other. As each cable section can
be up to 1500 ft (450 m) in length, and you can have up to three
repeaters between a pair of nodes, the maximum length between any
pair of nodes in a linear configuration will be 6000 ft (1800 m).
Figure 16 shows the maximum linear configuration using RR85
Repeaters.
RR85
REPEATER
6000 ft (1800 M) CABLE, 64 NODES MAX.
END
NODE
END
NODE
RR85
REPEATER
RR85
REPEATER
ONE SECTION 1500 ft (450 M) CABLE, 32 NODES MAX.
SECTIONS: 1 2 3 4
Figure 16 Maximum Linear Configuration of a Single Network