Replacing The Optional Backup Battery - Siemens SIMATIC TP 270 Operating Instructions Manual

11.2

Replacing the optional backup battery

Function of the backup battery
An optional backup battery is available for the HMI device. The battery ensures that in the
event of a power failure, the HMI device's internal hardware clock continues to run.
Under normal operating conditions, the battery has a service life of approx. four years. It is
not supplied with the HMI device.
Supply source
The battery can be ordered from the Siemens spare parts service. It is shipped ready for
installation with a cable and connector. Please refer to the Siemens Catalog ST80 for the
order number.
Procedure
Caution
Change the battery while power is still being supplied to ensure the internal hardware clock
continues to run.
The battery must be changed by a properly qualified person.
Before replacing the battery, refer to the ESD Guidelines.
1. Unplug the battery cable connector from the two-pin socket in the HMI device.
2. In the case of the MP 270B 10", TP 270 10" or OP 270 10", the battery is normally
3. In the case of the MP 270B 10", TP 270 10" or OP 270 10", secure the battery at the back
4. Insert the battery lead connector back into the socket. The plug is coded to prevent
General information
Please observe the following safety notes to ensure correct handling and disposal of lithium
batteries:
TP 270, OP 270, MP 270B (WinCC flexible)
Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0
secured at the back of the HMI device with two cable ties, In the case of the MP 270B 6",
TP 270 6" or OP 270 6", one cable tie is used. Cut the cable ties, using pliers for
instance, and remove the empty battery.
of the HMI device with two cable ties. In the case of the MP 270B 6", TP 270 6" or OP
270 6", use one cable tie.
reversed poling.
Maintenance/Service
11.2 Replacing the optional backup battery
11-3