Toshiba T2N - Manual (Page 134)

5.RAS Functions
User’s manual 121
I/O bus parity check Bus parity is checked when the
I/O module is accessed. ( At
batch I/O processing and direct
I/O instruction) Error registration then error
down. (However, recovere by
retries, only registration takes
place; no error down.)
LP function check Test program run in LP
(language processor) and
checked for correct results.
(When running the user
program) Error registration then error
down. (However, recovered by
retries, only registration takes
place; no error down.)
LP illegal instruction
detection check Checks whether or not illegal
command detected in LP
(language processor). (When
running the user program) Error registration then error
down.
Scan time over check Checks that scan cycle does not
exceed set value (200ms).
However, set value can be
changed by user instruction
(WDT). (When running the user
program) Error registration then error
down.
(4) Diagnostics during normal running (take place in background)
Diagnostics Diagnostics details Processing when error detected
Watchdog timer check Watchdog timer system runaway
check. (Set at 350ms) Error registration, transition to
ERROR mode after system
reset.
User memory check User memory (RAM) read/write
checked. Error down after error register
(with retry)
Battery check Memory backup battery voltage
checked. Alarm
Calendar LSI check Date and time data read from
calendar LSI every 300ms,
accuracy checked, data set in
special register. Alarm. Until calendar reset, date
and time data are HFF.
For details of registration in the event history table when a error occurs
and the special relay addresses that are set, refer to Part 1, section 6.
NOTE