FPΣ User's Manual
6.8 Backup Battery
95
6.8 Backup Battery
Installing a backup battery in the FPΣ makes it possible to use:
• the clock/calendar function
• additional hold areas for data registers or other data (see "
Specifying Hold Areas" on
page
97)
REFERENCE
See "
Clock/Calendar Function" on page 35.
Battery (optional)
Product name Product number
FPΣ battery
AFPG804
Battery replacement
To avoid accidental data loss, be sure to replace the battery before the end of its lifetime.
CAUTION
If the battery is empty or no battery is present and additional hold areas have
been defined, the hold/non-hold operation becomes unstable. The data value
will become indefinite. It is not cleared to 0 the next time the power is turned on.
Do not forget to monitor the battery status or to reset the hold areas to the
default values if no battery is used.
An empty battery status is indicated by the following:
• Special internal relays R9005 and R9006 will turn to TRUE if the battery voltage
drops. The relays can be evaluated using the system variables
sys_bIsBatteryErrorHold and sys_bIsBatteryErrorNonHold.
• The ERROR/ALARM LED will flash if the battery voltage drops and system register
no. 4 "Battery error indication" has been set to "Enable" "
Setting the Battery Error
Alarm" on page
96.
The backup battery voltage is checked two seconds after the power is applied. Therefore, the
error is not announced in the first scan after operation has started.
The battery remains effective for about a week after the alarm is issued, but in some cases
the problem is not detected immediately. The battery should be replaced as soon as possible.
See "
Installing the Backup Battery" on page 96.
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