Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 78)

Chapter
Operating in SVĆCompatible Mode
5
5Ć27
BT WRITE transfers a block of data from the scanner to the specified
I/O module.
Upon issuing a block-transfer request, the scanner writes 0x2F in the
confirmation status byte to indicate that the scanner accepted the request
and put it into its queue. When the scanner actually completes the
block-transfer, the scanner sets the semaphore and then it updates this data
in the following order:
1. address
2. block transfer tag
3. length of data
4. confirmation status
5. block transfer read data
6. command complete interrupt (if enabled)
command
confirmation
BT tag
address
not used
not used
not used
not used
0-64 = number of words to write
to the I/O module
BT write data
as many as 64 words
Byte offset
(Hex)
102
104
106
11E
Name
11C
02H is both sent and returned.
Bit 7 = semaphore
120
channel A
control/status
channel A
general data
-(length-1)
-FBF not used
(length)
108
10A not used
-11B
0-41 = unique number transfer
address of I/O module
not used
not used
semaphore
103
105
11D
length of
data
11F
107
109
00H = transfer was successful
2FH = block transfer put in queue OK
any other value indicates an error
The VME master processor writes 02 (hex) to the command byte. Then
the VME master processor writes these parameters to the selected
channel’s control status area:
BT WRITE
command byte 02
description
parameters