01/2007
1.1 Overview of SINUMERIK 840Di sl
1-29
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
Interrupt: Power–Fail detected, NCK/PLC restart with OK.
SINUMERIK 840Di sl NCK/PLC
Notice
1. Supply voltage
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
Chapter: PCU 50.3
2. 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 1.1.9, Page 1-31).
3. Replacing the MCI board 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 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 5.3.3, Page 5-112.
The SINUMERIK 840Di sl monitors three different temperatures for their respec-
tive thresholds:
1. Housing temperature
2. CPU module temperature
3. CPU temperature
Error response
S Interrupt: ”2110 NCK temperature alarm”
S Logbook entry: ”Alarm: Critical temperature”
Cause of errors/error handling
One of the 3 monitored temperatures has reached or exceeded its threshold
value. A temperature change of at least 3°C below the threshold is required for
the alarm to reset.
If the temperature alarm occurs, the user and/or the machine manufacturer
(PLC user program) must decide whether to interrupt machining and end and
shut down the SINUMERIK 840Di sl.
Temperature
monitor
1 General Information on the SINUMERIK 840Di sl
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