Name Function Status Meaning
COM Communi‐
cation
LED off
CP not ramped up / started
LED lights up green
Communication via CP possible (RUN operating state)
LED flashes green
Communication possible (no configuration)
LED lights up yellow
CP was stopped via PLC/TIA. No communication.
LED flashes yellow
Configuration received and transition to the RUN operating state.
LED flashes red
Error status (FATAL error)
DIAG Diagnostics
LED lights up green
Everything OK.
LED lights up yellow
Software-related fault is pending. Generate the diagnostic data with
the Diag button and so contact the Hotline.
LED flashes yellow
(0.5 Hz)
The data backup operation initiated with the Diag button is running.
LED lights up red
HW-related tests fail, e.g. memory test during switch on.
If no change occurs after multiple switch off/on, replace the device.
SD Activity
LED
(directly on
the card slot)
LED off
No SD card inserted.
LED flashes yellow
Active access to SD card
Important LED states
● If all the LEDs are flashing, the PLC must be reset (general reset) via the mode selector
switch.
● While the PPU is ramping up, all LEDs briefly light up orange. You can carry out a detailed
diagnosis using a PG/PC and the operating software.
Additional references
● For information on drive faults and alarms, see also:
SINAMICS S120/S150 List Manual (LH1)
System characteristics
3.2 Operator controls and display elements
PPU 1740
30 Equipment Manual, 01/2019, A5E47615272B AA
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