6ć39 – Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner User Manual
Page 120
Chapter
Operating in SVĆSuperset Mode
6
6Ć39
Use the SV2 flag, VME flag, and turn flag to determine who has access to
the continuous block-transfer write table. If the scanner has the lock so
that it can update the block data, the scanner copies 64 words at 6.4 msecs
before releasing the lock. The VME master processor would at most busy
wait 7 msecs before it could acquire the lock.
Figure 6.15
Format for the continuous blockĆtransfer address byte
0 = terminals 00-07
1 = terminals 10-17
6
5
4
3
2
1
0
7
Figure 6.16
Format for the continuous blockĆtransfer interrupt level and status ID
000 indicates no interrupt
6
5
4
3
2
1
0
13 12 11 10 9
8
7
15 14
Your code for the CONTINUOUS BT READ command should include
these tasks:
1. get the semaphore
2. set up the control status area
3. send the command interrupt
4. wait for the result
(either poll for confirmation status or wait for an interrupt)
5. clear the semaphore
coding sequence