7I76 38
REFERENCE INFORMATION
SSLBP
DISCOVERY SEQUENCE:
for process data discovery (of one channel) the sequence of operations is as
follows:
Note that the first section acquires the PTOC and the second section reads the
records pointed to by the PTOC. For brevity, the remote read sequence (steps 5 through
9 of the remote read procedure) will be listed here as "remote read"
FIRST PART, ACQUIRE PTOC:
1. Issue a STOPALL (0x800) command, wait for COMMAND register clear to verify stop
command completion.
2. Issue a setup START command (0xFNN) with bitmask (NN) of channels to start
3. Wait for COMMAND register clear to verify start command completion. (may be many
mS)
4. Read data register to verify that the selected channels started (a 1 bit means a fault in
the channel that the bit represents)
5. Read PTOCP from interface register 2, of selected channel, if zero, remote device does
not support discovery
6. Remote read word at PTOCP
7. If word data is 0, PTOC collection is complete goto step 11
8. Save value in local PTOC table, and increment local PTOC table index
9. Increment PTOCP value by 2 (as it is a word pointer)
10. Repeat from step 6
To Next Page
Loading...
