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Appendix
Appendix
Battery Backup Function
The XSEL controller uses the following two batteries.
System-memory backup battery
A coin-type battery is used to back up the position data, SEL program variables, etc., in the controller. Each
controller is shipped with the system-memory backup battery.
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
A coin-type battery with holder is installed in the panel on the front side of the controller, in order to retain the
various data stored in the system memory (SRAM) of the XSEL controller even when the power is cut off, thus
effectively implementing a system memory backup.
The data backed up in the system memory (SRAM) includes SEL global data, position data, coordinate definition
data and content of the user-data backup memory in the controller with expanded memory (with gateway
function). This data will be retained even after the power is cut off.
Take note that position data and content of the user-data backup memory are also stored in the flash ROM.
Accordingly, no battery is required if operation is always resumed using the data in the flash ROM after the
power has been cut off or a software reset has been performed (in which case the value set in other parameter
No. 20 must be changed to “0” (no backup memory)).
Note: On a controller with expanded memory (with gateway function), only position data from Nos. 1 to 10000
will be backed up. To also back up position data of No. 10001 onward, write the data to the flash ROM
before the power is cut off.
The system-memory backup battery is a coin-type battery (model number CR2032). Since the retention
characteristics of this battery will vary significantly depending on the storage temperature and operating
environment, due caution must be exercised when handling the battery.
Although this coin-type battery is readily available in supermarkets, convenience stores, etc., batteries by other
manufacturers may offer different retention characteristics. To maintain consistency, use a battery by the same
manufacturer whenever possible.
<Backup Time>
The recommended replacement interval for the system-memory backup battery is one and a half years. This
may be a little misleading. It means that if the battery is left at ambient temperature of 40
C, it will retain the
stored data for one and a half years. In normal operating conditions, the battery can retain data for a longer
period.
As a guide, the battery will last for around three years if the controller is used at ambient temperature of 40
C
with the controller powered up 50% of the time.
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