Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 14)

Chapter
Scanner Overview
1
1Ć6
For more information, see the VMEbus specification (revision C.1)
published by VITA (VMEbus International Trade Association), 10229 N.
Scottsdale Rd., Suite B, Scottsdale, AZ, 85253, (602) 951-8866. Contact a
VITA representative for a copy.
VMEbus Address Modifier Codes
The scanner can respond to the following VMEbus address modifier codes,
depending on how you configure the scanner’s address space and response
to VME accesses.
This code
(hex):
means:
3D standard (A24) supervisory access
39 standard (A24) nonĆprivileged access
2D short (A16) supervisory access
29 short (A16) nonĆprivileged access
The scanner runs asynchronously to other VME master processors. Once
in Run mode, the scanner continuously scans all the adapters in its scan
list. The scan list identifies which adapters to scan and in what order to
scan them. An adapter can appear several times in the scan list. For more
information about using the scan list, see chapter 4.
When the scanner scans an adapter, it brings in digital input data and
places the data in the scanner’s input image table. At the same time, the
scanner sends digital output data to the adapter.
How the Scanner Scans