IAI America RCS-C - Manual (Page 41)

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If the battery was replaced while the controller power was off, the position information (absolute data) may or
may not be retained depending on how long the controller remained without battery.
Time without battery Retention of position information (absolute data)
Less than 5 minutes Position information (absolute data) is retained. Absolute reset is not necessary.
5 to 15 minutes
A battery alarm occurs. Position information is retained. Absolute reset is not
necessary.
More than 15 minutes
A battery error occurs. Position information is not retained. Absolute reset is
necessary.
Note) The position-information (absolute-data) retention function during battery replacement is supported by
the 100/200-V controller of version M5 or later.
If a battery error was already present before the replacement, an absolute reset will be required even if
the controller has been without battery for no more than 15 minutes.