Siemens SINUMERIK MCU1720 Equipment Manual page 29

RUN/STOP LED
LED flashes
yellow/green
Meanings of the HMI LEDs
LED
PC ON/WD
RUN/STOP or L1
ERROR or L2
MAINT or L3
You can find program examples to control LEDs under the Windows operating systems at the
Customer Support page Industry Automation and Drive Technologies.
support.industry.siemens.com/cs/start?lc=en-WW)
Important LED states
● If all the LEDs are flashing, the PLC must be reset (general reset) via the mode selector
switch (ramp-up with the switch in the "MRES" position).
● While the MCU is powering up, all LEDs briefly light up orange. You can carry out a detailed
diagnosis using a PG/PC and the operating software.
Further information
You can find more information about LED states during ramp-up here:
● Commissioning Manual, Basic Software and Operating Software
You can find more information about the drive faults and alarms here:
● List manual (LH1) SINAMICS S120/S150
MCU 1720
Equipment Manual, 09/2019, A5E47437728B AB
ERROR LED
LED flashes red LED flashes yellow
Status
Off
Green
Flashing green/yellow
(1 Hz)
Yellow
Flashing red (1 Hz)
Off
Green
Yellow
Off
Red
Flashing red
Off
Yellow
Red
4.2 Operator control and display elements
MAINT LED
Startup (booting the CPU)
Test the LEDs during startup, insert a module.
LED flash test
Description
-
BIOS ready to boot; PC is running
BIOS in POST, power switch on
Idle state
Watchdog status display: Active
-
Can be controlled from the user program
Can be controlled from the control program
(e.g. WinAC)
-
-
Can be controlled from the user program or the
control program (e.g. WinAC)
-
-
Can be controlled from the control program
(e.g. WinAC)
Description
Meaning
(https://
29