Siemens SINUMERIK ONE NCU 1750 - Page 36

RUN/STOP LED ERROR LED MAINT LED Meaning
LED lights up green LED o󹪜 LED o󹪜
The CPU is in the RUN operating state.
LED lights up green
LED 󹪞ashes red
LED o󹪜
Diagnostic event pending.
LED lights up green LED o󹪜 LED lights up yellow
A plant maintenance request is pending.
The a󹪜ected hardware must be validated/replaced
within a short interval.
Active force job
PROFIenergy pause
LED lights up green LED o󹪜
LED 󹪞ashes yellow
A plant maintenance requirement is pending.
The a󹪜ected hardware must be validated/replaced
within a foreseeable interval.
Con󹪝guration faulty
LED lights up yellow LED o󹪜
LED 󹪞ashes yellow
Firmware update completed successfully.
LED lights up yellow LED o󹪜 LED o󹪜
CPU is in STOP operating state.
LED lights up yellow
LED 󹪞ashes red LED 󹪞ashes yellow
The program on the SIMATIC Memory Card causes a
error.
CPU defective
LED 󹪞ashes yellow
LED o󹪜 LED o󹪜
CPU performs internal activities during STOP, e.g.
ramp-up after STOP.
Downloading the user program from the SIMATIC
Memory Card
LED 󹪞ashes
yellow/green
LED o󹪜 LED o󹪜
Startup (transition from RUN → STOP)
LED 󹪞ashes
yellow/green
LED 󹪞ashes red LED 󹪞ashes yellow
Startup (booting the CPU)
Test the LEDs during startup, insert a module.
LED 󹪞ash test
Description
4.4 Operator control and display elements
NCU 1750
36 Equipment Manual, 01/2022, A5E45627807B AE