Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 54)

Publication 1747-UM013B-EN-P - January 2005
4-10 Scanner Configuration and Programming
Illegal Configuration Examples
Having a primary device configured at Logical Rack 1, Logical Group
2 (bit 5) would be illegal since this image space is already being used
by a complementary device. Having a complementary device
configured at Logical Rack 10, Logical Group 2 (bit 9) would also be
illegal since this image space is already being used by a primary
device.
Note that the complementary device at Logical Rack 8, Logical Group
2 could be an ASB using 10 words (1-1/4 logical racks) of data, and
thereby cross into RIO Logical Rack 9.
The G file configuration on page 2-6 would provide the primary and
complementary input images to the scanner, which are illustrated on
the following pages. Note that the output images would be the same.
Example Scanner Input Image of the Primary Devices
Below are the primary device addresses and sizes. The following page
contains complementary device addresses and sizes.
• Device 1 - starting at Logical Rack 0, Logical Group 2 is a
primary 3/4 logical rack device.
• Logical Rack 1, Logical Group 0 contains no primary device.
• Device 2 - starting at Logical Rack 1, Logical Group 6 is a
primary 1/4 logical rack device.
• Device 3 - starting at Logical Rack 2, Logical Group 0 is a
primary 3/4 logical rack device.
• Device 4 - starting at Logical Rack 3, Logical Group 2 is a
primary 1/4 logical rack device.
• Device 5 - starting at Logical Rack 3, Logical Group 6 is a
primary 1/4 logical rack device.