Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 66)

Publication 1747-UM013B-EN-P - January 2005
4-22 Scanner Configuration and Programming
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 Module
Run Test Program
Fr
om
T
h
is
Mo
du
le
Power up
DR = 0 (1)
ROR = 1
(2)
Default values are set automatically.
Outputs reflect those of the scanner
output image.
DR = X (3)
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 = 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
(1) DR = Device Reset
(2) ROR = Remote Output Reset
(3) X = Setting does not matter