Logical rack 0 logical rack 1 – Rockwell Automation 1747-BSN Backup Scanner Module User Manual

Page 30

Publication 1747-UM010B-EN-P - September 2003

1-16 Overview

I = Input Module
O= Output Module

Slot Pair

Complementary Chassis

Primary Chassis Configured As:
Logical Rack Number

Logical Group Number

Image size (logical groups)

Addressing Mode

1/2-slot

Primary/Complementary

Primary

Primary Chassis

Slot Pair

Complementary Chassis I/O Image

Input Image

from Complementary Chassis

Output Image

from Complementary Chassis

Primary Chassis I/O Image

Input Image

from Primary Chassis

Output Image

from Primary Chassis

Slot Pair

= unused image
space

Input Image

Output Image

Scanner’s I/O Image

Both images are overlapped in
the scanner. The overlapped
image appears where the
primary chassis image is
configured to reside.

In this case, the primary
chassis image is configured as
starting logical rack 0 and
starting logical group 0.

Slot Pair

Complementary Chassis Configured As:
Logical Rack Number

8 decimal

Logical Group Number

Image size (logical groups)

Addressing Mode

1/2-slot

Primary/Complementary Complementary

Slot 1

Octal
Decimal

Slot 1

Logical
Rack 0

Logical
Rack 1

Group 0
Group 1

Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7