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Description
4.4 Operator control and display elements
RUN/STOP LED
LED lights up green
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
36
ERROR LED
LED off
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
MAINT LED
The CPU is in the RUN operating state.
LED off
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
Meaning
Equipment Manual, 01/2022, A5E45627807B AE
NCU 1750
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