Allen-Bradley 1747-SN - Page 65

From this mode
4–20 Scanner Configuration and Programming
Publication 17476.6 - July 1996
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.
Example 3 – When going from Run to Program mode, if both of the
appropriate bits in the Device Reset and Remote Output Reset words are
reset to 0 before leaving Run mode, the RIO link device is instructed to
decide whether to hold its last output state or to reset its outputs.
To this mode
Run Test Program
Power up DR = 0
ROR = 1
Default values are set automatically .
Outputs reflect those of the scanner
output image.
DR = X
ROR = X
Run ROR = X
DR = 0 Outputs are unchanged.
DR = 1 Outputs are turned OFF .
DR = 0 In this instance, the last
ROR = 0 state switch setting is
valid.
DR = 0 In this instance, the last
ROR = 0 state switch setting is
valid.
DR = X
ROR = 1 These two combinations
will reset device outputs.
DR = 1
ROR = X
DR = X
ROR = 1 These two combinations
will reset device outputs .
DR = 1
ROR = X
Test DR = 0
ROR = 1
Default values are set automatically .
Outputs reflect those of the scanner
output image.
DR = 0 In this instance, the last
ROR = 0 state switch setting is
valid.
Once these outputs are reset, they
remain reset regardless of the DR
and ROR settings.
DR = X
ROR = 1 These two combinations
will reset device outputs.
DR = 1
ROR = X
Outputs remain unchanged.
Program DR = 0
ROR = 1
Default values are set automatically .
Outputs reflect those of the scanner
output image.
DR = 0
ROR = 1
These default values are set
automatically . Outputs are reset,
unless ROR is changed to 0 on the
first scan.
DR = X
ROR = X
DR = Device Reset
ROR=Remote Output Reset
X = setting does not matter