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Modbus Plus for DIO Servicing
28
870 USE 103 00 May 2001
Modbus Plus Network Layouts
Overview This section provides two examples of Modbus Plus network layouts using
communication adapters in a distributed I/O control application.
Note that only one programmable controller and the required I/O nodes are present
in this kind of application.
Single Cable
Example
The figure below illustrates a single cable configuration.
170 PNT 110 20
with
I/O bases
Node 4
Node 2Node 5Node 3
Node 1
Programmable
Controller
with
Modbus Plus
Port
Network Trunk Cable Tap
I/O field device wiring
Drop Cable