Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 69)

Publication 1747-UM010B-EN-P - September 2003
Configuration and Programming 5-7
•
If you configure your system so that complementary I/O is not
selected (words 3 and 4 are zero), you must not set up any of
the actual devices to be in the primary mode. If you do, the
system flags the device as faulted and prevents the device from
running.
•
Control functions (i.e., device inhibit, device reset, and device
output reset) are only selectable for the primary device, but also
apply to the complementary device. Control functions for
complementary devices cannot be exclusively enabled.
Example: G File Showing Primary and Complementary Device Configurations
In the example that follows, the scanner is configured to communicate
with primary and complementary devices. Below are the device
addresses and image sizes:
•
Logical Racks 0/8, Logical Group 2 contain a primary 3/4 logical
rack device and a complementary 3/4 logical rack device.
•
Logical Racks 1/9, Logical Group 0 contain no primary device
and a complementary 1/2 logical rack device.
•
Logical Racks 1/9, Logical Group 6 contain a primary 1/4 logical
rack device and a complementary 1/4 logical rack device.
•
Logical Racks 2/10, Logical Group 0 contain a primary 3/4
logical rack device and a complementary 1/4 logical rack device.
•
Logical Racks 3/11, Logical Group 2 contain a primary 1/4
logical rack device and a complementary 1/2 logical rack device.
•
Logical Racks 3/11, Logical Group 6 contain a primary 1/4
logical rack device and no complementary device.