
19. MAINTENANCE FUNCTION
933
Cause and ResponseMessage
S SRAM DATA BACKUP
ERROR.
HIT SELECT KEY.
An attempt to write a backup file to a memory
card failed.
Check that the memory card is normal.
Check that the memory card’s battery is not
exhausted, that its circuitry has not been
damaged, and that it is securely inserted into
its slot.
SRAM PARITY
OCCURRED.
PLEASE POWER OFF.
A parity error was detected during backup
operation of SRAM (Note).
NOTE Action to be taken when an SRAM parity error is detected during
backup of SRAM in the boot system
The SRAM area of each CNC shipped from the factory is cleared
and is free of parity errors. However, shock applied to the CNC dur-
ing transportation may cause a parity error in the SRAM area. If the
backup battery of the CNC is dead, a parity error can occur in the
SRAM area. If a parity error occurs in the SRAM area, the data held
in the SRAM area is not guaranteed. However, the CNC does not
always use the entire SRAM area. A parity error is not detected by
hardware unless the part containing the error is read. Therefore,
if a parity error occurs in an area not accessed by the CNC, the
CNC may operate normally. The SRAM backup function of the boot
system reads the entire SRAM area. So, a parity error may occur
in the middle of backup operation even when the CNC has oper-
ated normally. In this case, the SRAM data of the CNC is not guar-
anteed, and the data cannot be backed up using the SRAM backup
function of the boot system. Nevertheless, the CNC may operate
normally. So, it is recommended that necessary data be backed
up using the Floppy Cassette or Handy File, data all clear operation
be performed, then the backed up data be restored in the CNC.
Once all clear operation is performed, the parity error can be re-
moved. Then, the SRAM backup function of the boot system can
be used.
D If an error occurs, the corresponding error message appears on the
screen, together with the message “HIT SELECT KEY.” Note that the
[SELECT] soft key is disabled for errors whose clearing requires that
the power be turned off.