IAI America PSEL - Manual (Page 383)

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Appendix
 Battery Backup Function
The PSEL controller uses the following battery:
 System-memory backup battery (optional)
The optional battery is available for backing up position data, SEL program variables and other data.
 Simple absolute unit (optional): Model number PCON-ABU
A simple absolute unit is available as an option that can be used to make the controller work as an
absolute controller.
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 PSEL 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).)