General Information on the SINUMERIK 840Di sl
1.1 Overview of SINUMERIK 840Di sl
Manual
26 Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Voltage failure
A power failure lasting more than 5 ms is detected by the POWER FAIL functionality of the
SINUMERIK 840Disl as a fault scenario and the following actions are initiated:
● The background lighting of the operator panel display is switched off
● NC and PLC are closed down properly
● The NC and PLC user data are saved in the SRAM of the MCI board.
The battery-backed user data are available again immediately the next time the SINUMERIK
840Di sl is booted. The SINUMERIK 840Di sl is therefore ready to use again immediately,
without data loss.
If the power supply recovers before final PCU shutdown, the following message box is
displayed:
Alarm: Power-Fail detected, NCK/PLC restart with OK.
SINUMERIK 840Di sl NCK/PLC
NOTICE
The following is to be taken into account:
• 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
The NC and PLC user data in the SRAM of the MCI board and on the hard disk of the
PCU are backed up. If the MCI board or PCU battery is replaced after a power failure,
this will result in a data 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).
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