User guide

Communication Capabiliites
88
890 USE 108 00 August 2001
Modbus Plus Capabilities for Compact
Overview of
Modbus Plus
Modbus Plus is a local area network designed for industrial control applications. It
enables the A984-145, E984-245/255/265/275/285 Controllers to become a node
on the network and to communicate with other 984 controllers, host computers, and
special bridge and multiplexer devices. A network may comprise one or more
communication sections. One section can support up to 32 nodes. Up to 64 nodes
can exist on a network.
The following figure shows the maximum linear configuration.
32 Nodes/
Section Max
End
Node
RR85
Repeater
RR85
Repeater
RR85
Repeater
End
Node
6000 ft (1800 m), 64 Nodes per Network Max.