Fanuc Power Mate i-D/H Maintenance Manual

APPENDIX
B63175EN/03
C. BOOT SYSTEM
525
CAUTION
Action to be taken when an SRAM parity error is detected
during backup of SRAM in the boot system
The SRAM area of each Power Mate i shipped from the
factory is cleared and is free of parity errors. However,
shock applied to the Power Mate i during transportation may
cause a parity error in the SRAM area. A parity error may
also occur in the SRAM area when the Power Mate i was
kept switched off for one year or longer, and the battery has
been exhausted. If a parity error occurs in the SRAM area,
the data held in the SRAM area is not guaranteed.
However, the Power Mate i 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 Power
Mate i, the Power Mate i 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 Power Mate i has operated
normally. In this case, the SRAM data of the Power Mate
i is not guaranteed, and the data cannot be backed up using
the SRAM backup function of the boot system.
Nevertheless, the Power Mate i may operate normally. So,
it is recommended that necessary data be backed up using
the Handy File, data all clear operation be performed, then
the backed up data be restored in the Power Mate i. Once
all clear operation is performed, the parity error can be
removed. Then, the SRAM backup function of the boot
system can be used.
NOTE
To clear all the data, follow the methods described in
Appendix F.4, Setting/Maintenance Using the Power Mate
i Main Unit.

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