Specifications

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Modicon
™
Momentum
™
automation platform
Modbus Plus
™
communication adapters
Introduction
Modbus Plus
™
communication adapters for the Modicon
™
Momentum
™
I/O product
line can be plugged into any Modicon Momentum I/O base to create a functional I/O
unit on the Modbus Plus bus…and to provide a direct connection to the Modbus Plus
Network for the full family of Modicon Momentum I/O modules. This connectivity
enables communications with Modbus Plus compatible control products – including:
programmable controllers, industrial computers, operator control stations, drive
systems, and other controls – and provides a exible, cost-effective solution for
distributing I/O modules throughout a large area. To expand the capabilities of the
Modbus Plus Network for distributed I/O applications, the communication adapters
have been designed to permit up to 64 Modicon Momentum I/O modules to be
connected to the network without the need for signal repeaters.
Each Modicon Momentum I/O module is an individual node on the Modbus Plus
network with its address user-selected on the dual rotary switch on the front of the
communication adapter. The Modicon Momentum I/O modules can be congured for
the network, and assigned program reference numbers, by using either the Peer
Cop function, the MSTR function block instruction in the programmable controller,
or the Modbus Plus conguration in an industrial computer.
There are four types of communication adapters available:
170 PNT 110 20, Single Port, IEC Data Format
170 PNT 160 20, Redundant Port, IEC Data Format
170 NEF 110 21, Single Port, 984 Data Format
170 NEF 160 21, Redundant Port, 984 Data Format
IEC Data Format
This version of the Modicon Momentum Modbus Plus communication adapter
communicates I/O data to the programmable controller in the IEC data format, which
has bit numbering 0 through 15, right to left, within the data word (i.e., input or output
number 1 is bit number 0).
984 Data Format
This version of the Modicon Momentum Modbus Plus communication adapter
communicates I/O data to the programmable controller in the traditional 984 data
format, which has bit numbering 1 through 16, left to right, within the register (i.e.,
input or output number 1 is bit number 1).
Since Modbus Plus is supported by the Modicon
™
Quantum
™
and 984
™
controller
families, Modicon Momentum I/O can be added to existing control systems where
additional I/O capacity or a distributed I/O sub-network is needed.
Introduction