7.3.1 "SF" on the expansion module lights up red
Error during startup
After power-up, the modules of the MSS 3RK3 respond as follows:
LED display on the
faulty EM
LED display on the
following EMs
LED display on
the central unit
Meaning / Remedy
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up yellow
• "IN" or "Q" lights up
green
• "SF"
lights up red
• "DEVICE"
lights up yellow
Interruption on the system bus
Interruption in the connection upstream of the
faulty expansion module with the red "SF" LED.
Check the connection cables.
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up yellow
• "IN" or "Q"
Lights up green
• "SF"
lights up red
• "DEVICE"
ashes red
The rst EM downstream from the 3RK3 central unit
on which the "SF" LED lights up is defective and
must be replaced.
Error during test mode
In test mode, the modules of the MSS 3RK3 respond as follows:
LED display on the
faulty EM
LED display on the
following EMs
LED display on
the central unit
Meaning / Remedy
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up red
• "DEVICE"
lights up yellow
Interruption on the system bus
Interruption in the connection upstream of the ex‐
pansion module with the red "SF" LED. Check the
connection cables.
• "SF"
lights up red
• "IN" or "Qx"
are o
• "SF"
are o
• "IN" or "Q"
are o
• "SF"
lights up red
• "DEVICE"
lights up yellow
The rst EM on which the "SF" LED lights up is de‐
fective and must be replaced.
Error in safety mode
In safety mode, the modules of the MSS 3RK3 respond as follows:
LED display on the
faulty EM
LED display on the
following EMs
LED display on
the central unit
Meaning / Remedy
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up red
• "IN" or "Q"
are o
• "SF"
lights up red
• "DEVICE"
ashes red
Interruption on the system bus
Interruption in the connection upstream of the ex‐
pansion module with the red "SF" LED. Check the
connection cables.
• "SF"
lights up red
• "IN" or "Qx"
are o
• "SF"
are o
• "IN" or "Q"
are o
• "SF"
lights up red
• "DEVICE"
ashes red
The rst EM on which the "SF" LED lights up is de‐
fective and must be replaced.
Diagnostics / service
7.3 Diagnostics with LEDs
SIRIUS 3RK3 Modular Safety System
256 Equipment Manual, 07/2020, NEB926253002000/RS-AC/006
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