Fanuc Power Mate i-D/H Operation Maintenance Handbook

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(*1) 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 iD/H shipped from the factory is
cleared and is free of parity errors. However, shock applied to the
Power Mate iD/H 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 iD/H 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 iD/H 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 iD/H, the Power Mate iD/H 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 iD/H has operated normally. In this case, the SRAM
data of the Power Mate iD/H is not guaranteed, and the data cannot
be backed up using the SRAM backup function of the boot system.
Nevertheless, the Power Mate iD/H 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 Power Mate iD/H. Once all clear
operation is performed, the parity error can be removed. Then, the
SRAM backup function of the boot system can be used.
(*2) 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.)

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