IAI America SSEL - Manual (Page 385)

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Appendix
~ Battery Backup Function
The SSEL controller uses the following two batteries.
x System-memory backup battery (optional)
The optional battery is available for backing up position data, SEL program variables and other data.
x Absolute-data backup battery
A separate battery is used to retain the absolute encoder’s rotation data, so that the motor rotation data
can be retained/refreshed when the controller power is cut off. A controller specified with an absolute-
type actuator is shipped with the absolute-data backup battery.
Each battery is explained in details.
1. System-Memory Backup Battery
The system-memory backup battery can be installed on the top face of the controller so that the data
stored in the SSEL controller’s SRAM will be retained even after the power is cut off.
Data to be backed up include controller parameters, SEL language variable data (global variables),
position table data, and error list. The stored data will be retained even after the power is cut off.
(Use of the system-memory backup battery must be specified in the applicable controller parameter (other
parameter No. 20 = 2).)