7-segment display
Meaning
04
Before loading the kernel
05
Before starting the kernel
Booting the basic system
7-segment display
Meaning
1
Basic initializations
2
Cleaning up and preparing the file system
3
The name is set and the loopback interface configured.
4
Starting the system logging
Starting the CFS class 1, provide the network interfaces.
5
Initializing the network interfaces and the firewall
6
Starting the time server (ntpd)
7
Starting the SSH server (generate a host key if one is still not available).
8
Starting the FTP server
9
Starting the TCU services (TFTP, VNC)
P
Partitioned: The system performs a partitioning operation.
NRK/NCK power up
7-segment display
Meaning
1
Not applicable.
2
Not applicable.
3
Debugger was initialized.
4
NRK operating system was successfully activated.
5
NRK operating system has booted, init task is being processed (→ the appli‐
cation boots).
1 or 2
SD card and NVRAM data do not match. To resolve this problem, a general
reset is required by booting with switch position 1 or 2.
Operation
7-segment display
Meaning
6.
with flashing point: The control is in cyclic operation and the cycles are active.
4.4.4
Start-up and mode selector switch
The NCU is equipped with an NCK rotary coding switch and a PLC mode selector switch in the
form of a toggle switch with three settings:
Description
4.4 Operator control and display elements
NCU 1740
38
Equipment Manual, 10/2021, A5E51087503B AA