Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 14)

Publication 1747-UM013B-EN-P - January 2005
1-6 Overview
Scanner I/O Image
Concepts The scanner’s I/O image consists of RIO logical racks and I/O groups.
A full RIO logical rack consists of eight input image and eight output
image words. (A word consists of 16 bits of data.) Each word within
an RIO logical rack is assigned an I/O group number from 0 to 7.
You assign devices on the RIO link a portion of the scanner’s image.
Devices can occupy a quarter logical rack (2 input and output words),
half logical rack (4 I/O words), three-quarter logical rack (6 I/O
words), or full logical rack. You may configure devices to start at any
even I/O group number within an RIO logical rack. More than one
physical device’s (adapter) I/O information can reside in a single
logical rack. Also, by crossing logical rack boundaries, a device can
consist of more than one logical rack.
RediPANEL
PanelView Operator
Terminal
SLC Local Chassis
Scanner Processor
RIO Discrete
Transfers
with Adapter 1
RIO Discrete
Transfers
with Adapter 2
RIO Discrete
Transfers
with Adapter 3
RIO Discrete
Transfers
with Adapter 4
IMPORTANT
The following illustration shows only the input
image configuration of the scanner’s I/O image. The
output image configuration is the same.