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Introduction
8
870 USE 103 00 May 2001
Product Overview
Overview This section provides an overview of the features and function of the Momentum
Modbus Plus Communication Adapters.
Function The Modbus Plus Communication Adapters can be connected to any Momentum I/
O base to create a functional I/O module.
The adapters provide direct connection to the Modbus Plus network, enabling a
programmable controller to communicate with field devices wired to the I/O base
terminals.
The controller on the network can read from the input terminals and write to the
output terminals of the I/O base using Modbus Plus Peer Cop or MSTR Function
Block messaging.
Data Format Data bits are transferred in the IEC format. This is the standard data format for the
Momentum product line.
Models Model 170 PNT 110 20 has one Modbus Plus port for connection to a network with
a single trunk cable.
Model 170 PNT 160 20 has two ports for connection to either a single-cable or dual-
cable network.
Diagram The diagram below shows a Modbus Plus Communication Adapter mounted on a
typical I/O base.
I/O Base
Communication
Adapter
Modbus Plus Port A
(both models)
Modbus Plus Port B
(170 PNT 160 20 only)
Front
View
Side
View
Communication
Adapter
I/O Base