Hardware reference guide

Quantum Configurations

35013379 02 October 2007

Dual Cable DIO

Configuration

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

Note: The dual cable option is provided for systems that require added protection

against cable breaks or damaged connectors. With two cables connected between

the host and each node, no single cable break will disrupt communications.

I/OI/OI/O

DIO

Drop

I/OI/OI/O

DIO

Drop

I/OI/OI/OI/OI/OI/OI/ONOMCPUPS

*Tap

Local I/O

***Drop Cables

Quantum Drop # m

Up to 31 Nodes (63 with repeater)

Quantum Drop # n

***Drop Cables

*Tap*Tap

Up to 31 Nodes (63 with repeater)

*A MODBUS Plus tap (plastic, Part # 990NAD23000; ruggedized, Part # 990NAD23010) is required

for every participant on the network.

***A drop cable (8 ft/2.4 m, Part # 990NAD21110; 20 ft/6 m, Part # 990NAD21130) is required for

each drop from the MODBUS Plus tap. Cables are not included with the modules and need to be

ordered.

Trunk Cable

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