Hardware reference guide

Quantum Configurations

35013379 02 October 2007 39

Quantum Distributed I/O (DIO)

Overview Quantum DIO can be set up in standard single or dual cable configurations (refer to

the following two figures). The Quantum DIO architecture is based on Modicon's

Modbus Plus technology. When DIO is utilized, the Quantum system may support

up to three distributed networks of up to 64 drops (using a repeater) each.

Communication between the various nodes and the Modbus Plus head, in both

single and dual cable DIO configurations, is done by twisted pair cabling from the

head to the DIO adapters at the drops.

Documentation

For detailed information concerning the Quantum DIO systems, refer to the

MODBUS Plus I/O Servicing User Guide, part number 840USE10400.

Single Cable DIO

Configuration

The following figure is an example of a single cable Quantum DIO configuration.

I/OI/OI/O

DIO

Drop

I/OI/OI/O

DIO

Drop

I/OI/OI/OI/OI/OI/OI/OI/OCPUPS

* Tap * Tap

Local I/O

** Drop Cable

Quantum Drop # m

Up to 31 drops (64 with repeater)

Quantum Drop # n

** Drop Cable

* A MODBUS Plus tap is required for every participant on the network.

** A drop cable is required for each drop from the MODBUS Plus tap.

(Cables are not included with the mopdules and need to be ordered.)

This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com