Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 83)

Publication 1747-UM010B-EN-P - September 2003
Configuration and Programming 5-21
determine RIO device output operation, refer to that device’s user
manual.
To properly use the Device Reset and Remote Output Reset words,
you must consider the output control information sent to the devices
during two SLC processor operating conditions:
• Τ
he SLC processor is in any given mode (Run, Program, Test, or
Fault).
•
The SLC processor is leaving any mode and entering another.
If you do not modify the Device Reset and Remote Output Reset
words, the device outputs reflect the scanner output image whenever
the SLC processor is in Run mode. If the SLC processor is in Program,
Test, or Fault mode, it instructs the device to reset its outputs.
If you modify the default settings, the Device Reset and Remote
Output Reset words change. The table on page 5-22 contains
examples of what changes occur. The information in the table is based
on the assumption that the scanner’s slot is always enabled and the
RIO link device is communicating with the scanner.
To determine how the Device Reset and Remote Output Reset words
operate, locate the box where the row and column are headed by the
modes in question. The shaded boxes represent the Device Reset and
Remote Output Reset word operation while in that mode.
Example 1
When powering up into Run mode, the scanner, by default, resets the
appropriate bit in the Device Reset word to 0. The appropriate bit in
the Remote Output Reset word is set to 1. As a result, the RIO link
device outputs reflect the scanner’s output image.
Example 2
Once the SLC processor is in Run mode, the bits in the Remote Output
Reset word have no effect on the RIO link device’s outputs. Setting
the appropriate bits in the Device Reset Word to 1 instructs the RIO
link device to reset its outputs.
ATTENTION
!
When using the Device Reset and Remote Output
Reset words, you must completely understand and
fully test all device output operations before
beginning normal system operation.