Publication 1747-UM013B-EN-P - January 2005
Scanner Configuration and Programming
4-21
Device Reset and Remote
Output Reset
Considerations
The 1747-SN Scanner Device Reset words (M0:e.16 to M0:e.19) and
the Remote Output Reset words (M0:e.24 to M0:e.27) operate in
conjunction with each RIO device to determine the state of that RIO
device’s outputs. The output control information that the scanner
sends to the RIO device depends on how you configure these bits.
The RIO device acts on the output control information in accordance
with its functionality and configuration. To fully understand how a
specific device responds to the Device Reset and Remote Output
Reset words, you must determine the operation of the RIO device. To
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:
•
The 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 the following page contains
examples of what changes occur.
We base the information in the table
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.
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.
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