Installing the CPU 41x-2 PCI and the Software
Windows Automation Center, WinAC Slot Version 4.0
34
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
2.4
Installing and Connecting the Backup Battery
Use of a Backup Battery
You must use a backup battery:
•
For backing up a user program that you want to store in a power failure-proof
manner in RAM.
•
If you want to use the automatic warm restart/hot restart for the CPU 41x-2
PCI.
•
If you want to retentively store bit memory, timers, counters, time-of-day,
system data, and data in variable data blocks after Power Off/Power On.
A lithium cell (AA size, 3.6 V) is used for the backup battery supply of the
CPU 41x-2 PCI .
Note
The backup time of the supplied lithium cell is as follows:
•
CPU 412-2 PCI:
-
Typical backup time: 2900 hrs = 120 days
-
Minimum backup time (worst case): 1110 hrs = 46 days
•
CPU 416-2 PCI:
-
Typical backup time: 1610 hrs = 67 days
-
Minimum backup time (worst case): 740 hrs = 31 days
The typical backup time is empirically derived based on the backup current,
while the minimum backup time represents the sum of the values specified by
the manufactures of the memory chips.
Warning
Danger of personal injury and property damage, danger of release of harmful
substances.
Incorrect handling can cause a lithium battery to explode, improper disposal
of old lithium batteries can cause harmful substances to be released.
Therefore, follow the instructions below without exception:
•
Do not throw batteries in fire or apply solder to the outside of the battery
(maximum temperature of 100 °C). Likewise, do not recharge the
batteries. There is a risk of explosion!
•
Do not open the battery. Always replace with a battery of the same type.
Obtain replacement batteries from Siemens. This ensures that the battery
will be short-circuit proof.
•
Whenever possible, provide old batteries to battery
manufacturers/recyclers or dispose of them as hazardous waste.
