APPENDIX
B–63505EN/02
C. BOOT SYSTEM
349
Description and required actionMessage
S
SRAM DATA BACKUP ERROR.
HIT SELECT KEY.
Cause An attempt to write a backup file to a memory card failed.
Action Check that the memory card is normal.
SRAMXXXX * NOT FOUND.
HIT SELECT KEY.
Cause A backup file of the SRAM with a capacity of XXX cannot be
found.
Action A backup file is required for restoration.
SRAM PARITY OCCURRED.
PLEASE POWER OFF.
Cause A parity error was detected during backup operation of SRAM.
Action The SRAM areas of all CNCs are cleared before shipment
from the factory so that they are free from parity errors. If,
however, the CNC receives impact during transportation, or
it is left unused for one year or longer, causing the backup bat-
tery to run down, a parity error may occur in the SRAM area.
If a parity error occurs in the SRAM area, the data stored there
is not guaranteed. On the other hand, the CNC may not use
the entire SRAM area. It is when the portion where a parity
error occurred is called that the error is detected by the hard-
ware. If, therefore, a parity error occurs in a portion not ac-
cessed by the CNC, the CNC may operate without any prob-
lems. The SRAM BACKUP function of BOOT, however,
reads the entire SRAM area, and a parity error may be de-
tected during backup although the CNC operates without any
problems. Strictly speaking, if this occurs, the SRAM data of
the CNC is not guaranteed and the data cannot be backed up
using the SRAM BACKUP function of BOOT. Because, how-
ever, the CNC may operate without any problem, it is recom-
mended that the necessary data be backed up using a floppy
cassette or handy file, all data clear be performed, and then
the data backup be loaded into the CNC. Once all clear is per-
formed, the parity error is eliminated, making it possible to use
the SRAM BACKUP function of BOOT.