Rockwell Automation 6008-SV2R VMEbus remote I/O Scanner - Manual (Page 130)

Chapter
Starting the Scanner
7
7Ć4
You only power up the scanner after you’ve installed the scanner or when
you are trying to recover from a faulted state. When you power up the
scanner, the scanner does a self-test (POST state). If the self-test is
successful, the scanner:
moves into the SLEEP state.
writes 0xF0 to the command byte
writes the scanner’s name, firmware version, and copyright notice to the
VME ID area
sets input and output image tables to 0
deasserts
SYSFAIL
write 0x90 to the confirmation status byte
The VME master should monitor the confirmation status word to
determine if the power-up is successful.
When the scanner is in the SLEEP state, you have to “wake-up” the
scanner, which moves the scanner to the PROGRAM state, so it can accept
scanner management commands.
How the Scanner Uses SYSFAIL During Power Up
While the scanner is doing its self tests during power up, the scanner
asserts SYSFAIL on the VMEbus. When the scanner successfully
completes its self tests, it no longer asserts SYSFAIL. During a power-up
sequence, many other VME boards also assert SYSFAIL.
During normal operation in a VME system, the scanner watches the
SYSFAIL line and shuts itself down whenever the SYSFAIL signal is
asserted. However, during a system power-up sequence, some VME
boards might assert SYSFAIL longer than the scanner. In this situation, the
scanner doesn’t start monitoring for a SYSFAIL until SYSFAIL is no
longer asserted by another board during power up. You can also use the
SETUP command to instruct the scanner to ignore SYSFAIL signals.
There are some VME boards that assert SYSFAIL while the operating
system is booting up, which is after power has been applied and the other
boards have finished their self tests. In this case, the scanner will light the
FLT LED and go into the FAULTED state. And because the scanner is
faulted, it asserts SYSFAIL. You can RESET the scanner with the
RESET command.
Powering Up the Scanner