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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

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.

Output port No. 313 is assigned as the output of voltage low warning for system-memory backup battery.

Output port No. 314 is assigned as the output of voltage low warning for absolute-encoder backup

battery.

These warning output functions are available on controllers shipped on or after May 16, 2005. On

controllers shipped before this date, the functions can be enabled by setting “1” in I/O parameter Nos. 59

and 60.

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.

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