General Information on the SINUMERIK 840Di sl
1.1 Overview of SINUMERIK 840Di sl
Manual
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
25
1.1.7 Failure safety
Critical exception error (blue screen)
If Windows XP detects a fatal exception error during the operation of the NC system
software, the following steps are taken:
● Windows XP stops.
● Otherwise, an error message is output.
● NC and PLC continues to operate normally.
● The NC signals the fatal exception error detected to the PLC via the "PC OS fault"
interface signal.
Depending on the current machining situation, the PLC user program can either continue or
step machining.
After completion of machining, the PLC user program can request a shutdown of the PC by
sending the "PC shutdown" interface signal.
The "PC shutdown" interface signal causes the following actions:
● Retentive NC and PLC data are stored
● NC and PLC are closed down
● The Windows XP "Blue Screen" is displayed
● Execute reboot of the PCU (optional)
The behavior of Windows XP in the event of a fatal exception error (Blue Screen) can be
configured via the Control Panel:
Windows Start menu: Start > Settings > Control Panel > System
Note
For a product brief of the "PC OS fault" and "PC shutdown" interface signals, please refer
to Subsection
"840Di sl-specific interface signals" (Page 587).
NOTICE
The "PC shutdown" interface signal must be reset in the organization block OB100 (cold
restart) of the PLC.
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