Siemens NK8235

NK823x Structure and Functions
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Building Technologies 048_DMS_NK8000_ICC_MP4.40_A6V10062437_a_en.doc
Fire Safety & Security Products 06.2011
5 NK823x Structure and Functions
The NK823x is composed of an electronic board (with optional plug-ins) installed in
a compact and robust plastic box.
Note that NK823x units with build state up to 04 are equipped with the NKM8001-
A1 mainboard that do not support locally connected DF8000 I/O modules.
Instead, NK823x units with build state 10 or higher are equipped with the
NKM8001-A2 mainboard that can support up to 8 locally connected I/O modules.
Fig. 7 NK823x Ethernet port unit (NK8235 in this example)
5.1 Front panel
The front panel of the NK823x houses 9 LED's. The five LED's on the left side are,
from top to bottom:
Front panel LED Functions
Power (LED green) Power (hardware – controlled)
Vital functions (LED green) Software vitality (blinking)
Tamper (LED bicolour) Unit tamper:
– Red means tamper alarm (hardware controlled)
– Green means tamper disabled (from management station)
Download (LED red) NK823x network diagnostics:
– Off = Status OK
– Blinking (1 flash) = Missing identification from NS8xxx
– Blinking (2 flashes) = Not used
– Blinking (3 flashes) = Default mode ( switch settings in
section 4.2): FTP channel open
– On = Critical/hardware fault
Diagnostics (LED yellow) NK823x internal interface diagnostics:
– Off = Status OK
– Blinking (fast) = Booting operating system after restart
– Blinking (1 flash) = Missing or insufficient license
– Blinking (2 flashes) = Trouble with the I
2
C bus to I/O modules
– Blinking (3 flashes) = Not used
– Blinking (4 flashes) = Trouble with the serial/network interface
– Blinking (5 flashes) = Trouble with DLL or RCLOCK file(s)
– Blinking (6 flashes) = Modbus GW trouble:
– SW trouble.
– No communication to FS20/FS720
or to the Modbus Master/Client.
– No NK8237 or FS20/FS720 regis-
ters reading (Modbus Master
watchdog expired)
– On = Critical/hardware fault
Tab.5. LED functions on the front panel, left side