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Using the Modbus Plus Ports
870 USE 101 00 V.3 163
Cluster Mode Cabling Schemes
Introduction In cluster mode, Momentum I/O devices may be placed in small groups, connected
by much shorter lengths of cable than in standard Modbus Plus cabling schemes.
You may use clusters and standard single nodes in the same network.
Length of
Network
The maximum length of cable from one end of the network to the other is 1500 ft
(450 m) if no repeaters are used.
You can use up to three Modicon RR85 Repeaters to extend the cable to up to
6000 ft (1800 m). Each repeater allows you to extend the cable 1500 ft (450 m).
Number of
Devices in
Network
The maximum number of devices in a network is 64:
● If you use only Momentum products, you may use up to 64 devices on one
cable segment without a repeater.
● If you use a mixture of devices, you may use up to 32 devices on one cable
section. You must use a repeater to connect to another cable section. You
may use up to three repeaters and four cable sections in all.
Clusters in a
Network
The maximum number of clusters in a network is 8. The maximum number of
devices in a cluster is 8. Only Momentum devices may be used in the cluster.
Continued on next page
Description Part Number
Modicon RR85 Repeater NW-RR85-000