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

A reset operation resets the entire system and requires a system restart. This is comparable
to a "Power On reset" except that the 24 V power supply does not have to be switched off.
Booting for servicing purposes
For service or diagnosis purposes, the NCU can be booted from a service system, the
Emergency Boot System.
See also
How do you create a service system for the NCU? (Page 11)
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:
NCU Operating System (IM7)
Commissioning Manual, 01/2008, 6FC5397-1DP10-3BA0
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
Commissioning a System
1.3 Displays during system booting
7