IAI America SSEL - Manual (Page 362)

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Part 3 Positioner Mode
Chapter 5 Teaching Mode
In addition to normal positioning operation, jogging, inching and teaching can be performed in this mode.
A dedicated input is used to switch to the teaching mode, where the actuator can be moved using I/Os
and the achieved position can be written to the position data table.
Caution: Position data input via teaching will be lost when the power is turned off. To retain the
position data, one of the following measures must be taken:
x Install the optional system-memory backup battery to back up the position data. To do
this, the setting of other parameter No. 20 must be changed to “2.”
Note, however, that the position data may still be lost if the battery voltage drops.
(The battery should be replaced after approx. five years.)
If the battery is replaced as soon as a voltage-low warning generates, the data will be
retained.
Once a voltage-low error generates, the data will be lost.
Use the host PLC, etc., to monitor for a system-memory backup error output.
x Write the position data to the flash memory using a teaching pendant or PC (software).