General Information on the SINUMERIK 840Di sl
1.1 Overview of SINUMERIK 840Di sl
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
29
1.1.9
UPS system
Physical SRAM
The PCU has POWER FAIL detection in conjunction with the NC system software to ensure
that the user data are backed up in the SRAM of the MCI board during a PCU power failure
or power-off without a proper shut down of Windows XP.
The internal power backup time is not long enough for Windows XP to shut down properly.
This can be avoided by using a UPS, e.g. SITOP POWER DC UPS MODULE 15 (see
Section "Uninterrupted Power Supply UPS" (Page 87)). The UPS also backs up the power
supply of the PCU for a settable duration or until a set battery voltage limit has been reached.
This gives the user time to properly shut down Windows XP manually, or permits automatic
shutdown via a status signal from the UPS to the PLC, which then passes the "PC
shutdown" interface signal to the NC.
Connection options
The above UPS has the following connection options to signal the current status to the
SINUMERIK 840Di sl:
Table 1-1
Connection options of the UPS system
Connection
Signal to
Comment
1) UPS -> PCU:
USB connection
Windows XP
The UPS functionality is configured: see Configuration
below.
Advantage: Also works when the PLC user program is
not active.
Disadvantage: Does not work in the event of serious
exceptions from Windows XP (BlueScreen)
2) Signal terminals via free
interconnection -> S7 I/O
inputs
PLC
The UPS functionality is configured using the PLC
user program.
Advantage: Also works in the event of a fatal
exception error of Windows XP (BlueScreen)
Disadvantage: PLC user program must be active
3) Signal terminals via free
interconnection -> MCI
board extension inputs
NC
The UPS functionality is configured using the menu:
Settings in HMI Advanced (see Subsection "Menu:
Settings" (Page 490)).
Advantage: Also works in the event of a fatal
exception error of Windows XP (BlueScreen) and
when the PLC user program is not active.
Prerequisites: MCI board extension (option)
Note:
For 3)
For information on the boot response of the SINUMERIK 840Di sl with pending shutdown signal see
Subsection "Power-up with shutdown signal" (Page 133).
