Hardware reference guide
Quantum Configurations
32
35013379 02 October 2007
Quantum Local I/O, Remote I/O and Distributed I/O Configurations
Overview The following information contains a description of the Local I/O, Remote I/O and 
Distributed I/O and their configurations.
These configurations (see the configuration table below for valid Quantum 
configurations) can be equipped with a combination of: 
z Quantum CPUs
z Power supplies
z I/O interfaces
z Expert modules
z I/O modules
Local, RIO, and 
DIO 
Configuration
The following table provides valid Quantum configurations, including backplanes 
and modules.
Note: Refer to System Specifications for the Quantum Module , p. 55 for a 
complete list of part numbers for all Quantum modules.
If Configuration 
Type Is
Backplane Types 
(Typical) Are
Required 
Modules Are
Optional 
Modules Are
Modules Not 
Permitted Are
Local 6, 10, 16 slots Power Supply 
CPU
RIO Head, I/O, 
NOx*
RIO Drop, DIO 
Drop
RIO** 6, 10, 16 slots Power Supply 
RIO Drop
I/O CPU, RIO Head, 
DIO Drop NOx*
DIO 2, 3, 4, 6 slots DIO Drop Power Supply,  
I/O
CPU, RIO Head, 
RIO Drop NOx*
*NOM, NOA, and NOE.
**Remote I/O is typically used for large (number of modules) drops 6, 10, or 16 slot 
backplanes. Distributed I/O is typically used for small drops using 2, 3, 4, or 6 slot 
backplanes.
Note: Every Quantum module requires power from the backplane (except power 
supply and DIO modules). For a valid configuration, add up the required backplane 
current (in mA) for every module, and ensure that this number is less than the 
available power in the selected power supply. 
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com










