Siemens SINUMERIK ONE NCU 1740 Equipment Manual page 37

RUN/STOP LED
LED lights up green
LED lights up green
LED lights up green
LED lights up yellow
LED lights up yellow
LED lights up yellow
LED flashes yellow
LED flashes
yellow/green
LED flashes
yellow/green
NCU 1740
Equipment Manual, 09/2022, A5E51087503B AC
ERROR LED
LED flashes red
LED off LED lights up yellow
LED off
LED flashes yellow
LED off
LED flashes yellow
LED off
LED flashes red LED flashes yellow
LED off
LED off
LED flashes red LED flashes yellow
4.4 Operator control and display elements
MAINT LED
Diagnostic event pending.
LED off
A plant maintenance request is pending.
The affected hardware must be validated/replaced
within a short interval.
Active force job
PROFIenergy pause
A plant maintenance requirement is pending.
The affected hardware must be validated/replaced
within a foreseeable interval.
Configuration faulty
Firmware update completed successfully.
CPU is in STOP operating state.
LED off
The program on the SIMATIC Memory Card causes a
error.
CPU defective
CPU performs internal activities during STOP, e.g.
ramp-up after STOP.
LED off
Downloading the user program from the SIMATIC
Memory Card
Startup (transition from RUN → STOP)
LED off
Startup (booting the CPU)
Test the LEDs during startup, insert a module.
LED flash test
Description
Meaning
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