Power Off And Behavior In Case Of Power Failure - Siemens SINUMERIK 840Di System Overview

4 Software
4.4

Power OFF and behavior in case of power failure

The reliable operation of the SINUMERIK 840Di requires a correct shutdown of
Windows NT. This means that Windows NT is shut down either as usual via the NT
taskbar: Start > Shutdown or via a special PLC interface signal "PC shutdown". In
addition to shutting down Windows NT and all active applications, the retentive NC
and PLC data are saved both on the SRAM of the MCI Board and on the hard disk
of the PCU.
When the SINUMERIK 840Di is restarted, the saved data having the status of the
last correct shutdown will thus be available again. In certain service situations,
these data can be accessed to allow the SINUMERIK 840Di to continue work with-
out time-consuming re-startup:
•
Change of the backup battery of the MCI Board
•
Change of the MCI Board (new)
•
Change of the PCU (new) or reinstallation/update of the 840Di software
•
Change of the PCU or the MCI Board (from another 840Di)
•
Copying of a backup copy of the 840Di software
•
Power failure
Power failure
If the SINUMERIK 840Di is switched off by the user or as a result of a power failure
so that a correct shutdown of Windows NT is no longer possible, the retentive NC
and PLC data can only be stored in the SRAM of the MCI Board, but no longer on
the hard disk of the PCU.
If then servicing is required so that the NC and PLC data must be recopied from
the SRAM map of the PCU hard disk, a re-startup/reinstallation of NC and PLC is
required.
If Windows NT is not shutdown correctly, the Windows NT installation may be
damaged.
Uninterruptible power supply (UPS)
Optionally, the SINUMERIK 840Di can be connected via an uninterruptible power
supply (UPS). In case of a power failure or when the SINUMERIK 840Di is pow-
ered off without first shutting down Windows NT correctly, the UPS backs up the
power supply for several minutes and initiates a correct shutdown of
Windows NT.
An UPS is absolutely necessary if the user generally powers off the control system
without first shutting down Windows NT correctly.
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© Siemens AG 2001 All Rights Reserved
SINUMERIK 840Di System Overview (SYI) - 02.2001 Edition
02.2001