Illegal Configuration Examples - Allen-Bradley 1747-SN User Manual

Scanner Configuration and Programming 4–7

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 4–6 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.
Publication 1747 6.6 - July 1996