Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 111)

Chapter
Operating in SVĆSuperset Mode
6
6Ć30
The VME master processor writes 01 (hex) to the command byte. Then
the VME master processor writes these parameters to the selected
channel’s control status area:
Byte
offset:
Parameter: Description:
0207 module address The module address is the address of the I/O module from which
to read the block data. It contains the rack (0-15), group (0-7),
and slot (0 or 1) numbers of the I/O module. See Figure 6.13.
0209 blockĆtransfer tag number The blockĆtransfer tag number is an 8Ćbit integer that uniquely
identifies each blockĆtransfer. The scanner writes a value of 0 or 1
to the blockĆtransfer request tag number in the control/status area.
Values greater than 1 are reserved. If you write a reserved value
to this field, the scanner writes an illegal confirmation error (16H) in
the confirmation status byte.
This tag is returned with the status when the block transfer is
complete so the VME master processor can match the block
transfer status with the request.
021F length of data byte The length of data byte is an 8Ćbit value that specifies the number
of 16Ćbit words (0-64 decimal) to be read from the target
I/O module.
Use the value 0 to let the I/O module determine how many words
the scanner can read. When the blockĆtransfer completes, the 0 is
replaced by the actual number of words read.
Values greater than 64 are reserved. If you write a reserved value
to this field, the scanner writes an illegal confirmation error (16H) in
the confirmation status byte.
0220 BT data The BT data is the set of data words (0-64) read from the target
I/O module. The BT data block ends at offset (length of data - 1).
Figure 6.13
Format for the address byte
0 = terminals 00-07
1 = terminals 10-17
6 5 4 3 2 1 0 7
parameters