Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 66)

Publication 1747-UM010B-EN-P - September 2003
5-4 Configuration and Programming
Word 0 - contains scanner information for the SLC processor. Your
programming device automatically sets up Word 0. Do not attempt to
alter word 0.
Word 1, Primary/Normal Logical Device Address - specifies the
logical starting address of each primary/normal RIO link device. The
logical address consists of the logical rack number (0, 1, 2, or 3) and
starting logical group (0, 2, 4, or 6). Each bit in this word represents a
logical address. To specify an address, place a 1 at the bit
corresponding to the starting logical address of each logical device.
Word 2, Primary/Normal Device Logical Image Size - specifies the
logical image size (amount of scanner I/O image) of the devices set in
word 1. As with word 1, these bits correspond to RIO logical rack and
logical group numbers. To specify image size, place a 1 at each group
a device occupies.
Word 3, Complementary Logical Device Address - specifies the
logical starting address of each complementary RIO link device. The
logical address consists of the logical rack number (8, 9, 10, or 11
because a complementary device is always 8 above its primary) and
starting logical group (0, 2, 4, or 6). Each bit in this word represents a
logical address. To specify an address, place a 1 at the bit
corresponding to the starting logical address of each logical device.
Word 4, Complementary Device Logical Image Size - specifies the
logical image size (amount of scanner I/O image) of the
complementary devices set in word 3. As with word 3, these bits
correspond to RIO logical rack and logical group numbers. To specify
image size, place a 1 at each group a device occupies.
IMPORTANT
The term “primary” is used in conjunction with the
term “complementary,” when referring to a
complementary I/O configuration. Primary refers to
I/O image space found in Logical Racks 0 through 3
when in complementary I/O mode. Normal refers to
the same image space (racks 0-3) when not in
complementary I/O mode.
IMPORTANT
Setting device addresses in word 3 of the G file
configures the system to operate in the
complementary I/O mode. Not setting device
addresses in word 3 causes the system to operate
only in the primary/normal mode.