Displays During System Booting - Siemens SINUMERIK 840D sl Commissioning Manual

1.3

Displays during system booting

States of the RDY LED
Of the LEDs on the front of the NCU, only the RDY LED and its status is important when
booting up the NCU.
BIOS power-up
RDY LED:
Other LEDs:
Meaning:
Cause:
Downloading of operating system
RDY LED:
Other LEDs:
Meaning:
Booting up the kernel
RDY LED:
Other LEDs:
7-segment display:
Meaning:
Booting up the basic system
RDY LED:
Other LEDs:
Meaning:
NRK/NCK outputs
RDY LED:
Other LEDs:
Meaning:
NCU Operating System (IM7)
Commissioning Manual, 07/2007, 6FC5397-1DP10-2BA0
Yellow
All yellow, set by PLC/option module
No boot device was found: Code 1F or Code FF.
The CF card is defective or not bootable, or it does not contain
any system software.
Slowly flashing red (0.5Hz)
Set by PLC/option module
Loading the operating system involves three phases, which
are displayed on the 7-segment display.
Slowly flashing yellow (0.5Hz)
Set by PLC/option module
1
Phase 2: Driver initialization
Slowly flashing yellow/green (0.5Hz)
Set by PLC/option module
Phase 3: Initialization of the basic system
OFF (if fault status: red)
Set by PLC/option module
After the basic system, the NRK/NCK takes over the LED and
7-segment display.
Commissioning a System
1.3 Displays during system booting
7