User guide

Communication Capabiliites
890 USE 108 00 August 2001 93
Addressing
Ranges on
Modbus Plus
A single Modbus Plus network can have up to 64 addressable nodes, each with a
unique address in the range 1 ... 64. (See Modbus Plus Communications A984-145,
E984-245/255, p. 80 for more information about address settings). The Modbus
master device connected to the Modbus port can attach to any node using direct
attach address routing, simply by specifying the correct address in the range 1 ... 64.
Multiple networks can be joined via BP85 Bridge Plus devices, and nodes across
multiple networks can be addressed. An addressing capability outside the 1 ... 64
range is required.
In Modbus Plus, an explicit and an implicit attach address routing strategy are
available for this purpose. These routing techniques are described in Modbus Plus
Address Routing Schemes, p. 94.