Meaning of the RDY, COM, DIAG and SD Activity NCU LEDs
Name Function Status Meaning
RDY Ready
LED lights up red
There is at least one fault (e.g. RESET, watchdog monitoring etc.) or
the NCU is ramping up.
LED ashes red (2Hz)
SINAMICS communication error
LED lights up yellow
Ramping up the NCU.
LED ashes yellow
(0.5Hz)
Firmware update of the connected DRIVE-CLiQ components
LED ashes yellow (2Hz)
Firmware update is complete for components. Wait for POWER ON
for the components in question.
LED lights up green
NC ramped up and everything in cyclic mode
LED ashes
green/orange or
red/orange (1Hz)
LED-supported detection of connected DRIVE-CLiQ component is
activated: (p0124[0] = 1).
COM Communi‐
cation
LED o
CP not ramped up / started
LED lights up green
Communication via CP possible (RUN operating state)
LED ashes green
Communication possible (no conguration)
LED lights up yellow
CP was stopped via PLC/TIA. No communication.
LED ashes yellow
Conguration received and transition to the RUN operating state.
LED ashes red
Error status (FATAL error)
Description
4.4Operator control and display elements
NCU 1750
38 Equipment Manual, 10/2023, A5E45627807B AH
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