Siemens SINUMERIK 840Di sl Commissioning Manual page 28

General Information on the SINUMERIK 840Di sl
1.1 Overview of SINUMERIK 840Di sl
NC and PLC
On correct shutdown of Windows XP the following occurs:
● The SINUMERIK 840Di sl components NC and PLC are terminated correctly
● The NC and PLC user data in the SRAM of the MCI board and on the hard disk of the
If the PCU is switched off without first correctly shutting down Windows XP, the SINUMERIK
840Di sl's POWER FAIL functionality:
● ends the NC and PLC correctly;
● saves the NC and PLC user data in the SRAM of the MCI board.
The NC and PLC user data cannot be backed up on the hard disk of the PCU.
NOTICE
If you switch off the PCU without first having correctly shut down Windows XP, please
observe the following:
Power supply
A supply voltage of the PCU of at least 24 V is required to ensure consistency of the NC
and PLC user data.
References:
/BH/ Operator components Manual, Subsection "PCU 50.3"
UPS system
The internal power backup time after a power failure is not long enough for Windows NT to
shut down correctly. To remedy this, we recommend using an uninterruptible power system
(see Subsection "UPS-system" (Page 29)).
Exchange of MCI-boards or PCU-battery
When Windows XP is shut down correctly, the current NCK and PLC user data are saved
to the SRAM of the MCI board and to the PCU's hard disk. If the MCI board or the PCU
battery is replaced after the abnormal shutdown of Windows XP, this will result in loss of
the battery-backed user data on the SRAM of the MCI board.
How to proceed further: See Subsection "Power-up after changing the MCI-
Boards" (Page 129).
28
PCU are backed up.
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual