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Technical data • Complete system
32
Power Panel 500 user's manual V1.40
2.5.6 Battery
The lithium battery (3 V, 950 mAh) buffers both the internal real-time clock (RTC) as well as data stored in SRAM
on interface cards. It is located behind the black cover on the front of the device. The battery's buffer time is at least
4 years (at 50°C, 8.5 μA for the components being supplied and a self-discharge of 40%; if an interface board with
SRAM is installed, then the lifespan is reduced to 2½ years). The battery has a limited service life and should be
replaced regularly (after the specified service life at the latest).
Battery
Battery
Type
Removable
Service life
Renata 950 mAh
Yes, accessible from the outside
4 years
1)
Model number
Short description
Batteries
0AC201.91
Lithium batteries, 4 pcs., 3 V / 950 mAh, button cell
4A0006.00-000
Lithium battery, 1 pc., 3 V / 950 mAh, button cell
Battery
Battery
Table 12: Battery
1)
At 50°C, 8.5 µA of the supplied components and a self-discharge of 40%. If an interface board with SRAM has been installed, the service life is 2½ years.
Evaluating the battery status
The status of the battery is determined immediately after the device is started and subsequently checked by the
system every 24 hours. During this measurement, the battery is subjected to a brief load (approximately 1 second)
and then evaluated. Once determined, the battery status is displayed in BIOS (under OEM features - CPU board
features - CPU board monitor) and in the B&R Control Center (ADI driver); it can also be read in a customer
application using the ADI library.
Battery status
Function
N/A
The hardware or firmware being used is too old and does not support reading the battery status.
GOOD
Data buffering is intact.
BAD
From the point when battery capacity is recognized as insufficient (BAD), data buffering is intact for approximately another 500
hours.
Table 13: Battery status
From the point when battery capacity is recognized as insufficient, data buffering is intact for approximately another
500 hours. When replacing the battery, data is buffered for approximately 10 minutes by a gold leaf capacitor.