Replacing The Backup Battery - Siemens simatic hmi op27 Equipment Manual

Maintenance/Upkeep
19.2

Replacing the Backup Battery

Function
The backup battery ensures that, in the event of a power failure
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Service life
A lithium battery is used in the OP. It is already fitted when the device is sup-
plied. It has a typical service life under normal operating conditions of approxi-
mately four years. An exhausted battery is indicated in routine operation by a
system message on the OP. Replace the backup battery as quickly as possible
after the message is issued.
Source of supply The battery can be ordered via the Siemens spare parts service. It is shipped
ready for installation with a lead and connector. Refer to our catalog ST80.1
for the order number.
Before changing
Observe the following before changing the battery:
the battery
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the operating data in the SRAM of the OP are retained and
the hardware clock does not stop.
Caution
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Change the battery with the power supply switched on, in order to prevent
losses of data – for example, passwords.
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The battery must be changed by a suitably qualified person.
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Before replacing the battery, note the ESD guidelines in Appendix F of this
manual.
OP27, OP37 Equipment Manual
Release 05/99