IAI America XSEL-KET - Manual (Page 4)

CAUTION
Operator Calls Regarding Low Battery Voltage
This controller uses the following backup batteries to retain data after the power is cut off:
[1] System-memory backup battery
For retention of position data, global variables/flags, error lists, strings, etc.
[2] Absolute-encoder backup battery (optional)
For retention of encoder rotation data.
Each battery is of non-rechargeable type, so unless the battery is replaced before its life is fully consumed,
the battery voltage will eventually drop to a level where data can no longer be retained after the power is
cut off.
(The specific life of each battery varies depending on the operating time.)
Once data is lost, the controller cannot operate properly the next time the power is turned on, in which
case additional time will be required for recovery operation.
(Reference)
System-memory backup battery ---
A voltage low warning will generate when the voltage drops to
approx. 2.6 V from the rated voltage of 3.0 V, and data will be lost
once the voltage drops to approx. 2.3 V.
Absolute-encoder backup battery --- A voltage low warning will generate when the voltage drops to
approx. 3.2 V from the rated voltage of 3.6 V, and data will be lost
once the voltage drops to approx. 2.7 V.
In view of the above, this controller provides functions that allow voltage low warnings for the two batteries
to be output from I/O ports.
To output this signal from I/O ports, I/O parameter must be set.
 Warning output of system-memory backup battery
Set I/O parameter No. 59 to 1 --- Output port No. 313
(note) is assigned as the dedicated port.
 Warning output of encoder battery
Set I/O parameter No. 60 to 1 --- Output port No. 314
(note) is assigned as the dedicated port.
(Note) When these settgins are made, they cannot be used as general-purpose ports.
It is requested that the aforementioned functions be used to prevent unnecessary problems caused by low
battery voltage (consumption of battery life).
In particular, design engineers responsible for coordinating the system components should reflect, in the
design specifications, appropriate means for warning the operator using the I/O output signals utilizing the
above functions. Electrical design engineers should ensure that such means are reflected in the electrical
circuits.
For the battery replacement procedure, refer to the applicable section in the Operation Manual.
It is recommended that the latest data be constantly backed up to a PC in case of low system-memory
backup battery voltage or unexpected controller failure.