Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 12)

Chapter
Scanner Overview
1
1Ć4
The scanner complies with the VMEbus specification (revision C.1) and
responds to VME masters on the VMEbus. The scanner appears as an area
of global VME RAM to other master processors on the VMEbus. This
area contains the I/O image area, control/status area, general data area, and
interrupt ID area.
memory map for one channel
output image table
64 words
input image table
64 words
control/status area
16 words
general data area
1872 words
interrupt/VME ID area
32 words
output image table
128 words
input image table
128 words
control/status area
16 words
general data area
112 words
continuous BT write
16 entries
(72 words each)
continuous BT read
32 entries
(72 words each)
interrupt/VME ID area
32 words
SVĆcompatible mode SVĆsuperset mode
For more details on these memory areas, see chapter 5 or 6 for
SV-compatible mode or SV-superset mode, respectively.
There is no direct communication between a VME master processor and
the discrete I/O, rather the VME master processor communicates with the
I/O image table in the scanner (shown above). The VME master processor
reads the status of inputs from the input image table and controls the
outputs by writing data to the output image table.
VMEbus Relationship