FP2/FP2SHFP2/FP2SH Operation
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6.5 FP2SH Operation
6.5.2 Retaining Data If the Power Fails
Operation Memory Backup
Of the internal relays, data registers and other operation memories, data specified as
hold−type data in the system registers is backed up by the backup battery.
If internal relays, data registers and other memories are specified as hold−type data,
and the ROM or IC memory card is used, operation can be carried out without using a
battery, and no battery needs to be installed.
Setting the Alarm Battery Error
Normally, if a problem occurs with the backup battery, the “BATT.” and “ERROR” LEDs
on the front panel of the CPU light, to warn of a battery error.
During ROM operation, and when no operation memory backup is required, the alarm
battery error can be set to “off”. If this setting is entered, the “BATT.” and “ERROR” LEDs
do not light.
Method
The FPWIN GR tool software is used.
Procedure:
1. On the “O
ption” menu, select “PLC Configuration...”.
The “PLC Configuration” window is opened.
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