Led Displays - Siemens SINUMERIK MCU1720 Equipment Manual

4.2.2

LED displays

Meaning of the NC LEDs RDY, COM, DIAG and SD activity
Name Function
RDY Ready
COM Communi‐
cation
DIAG Diagnostics
MCU 1720
Equipment Manual, 09/2019, A5E47437728B AB
Status
LED lights up red
LED flashes red (2 Hz)
LED lights up yellow
LED flashes yellow (2 Hz)
LED lights up green
LED off
LED lights up green
LED flashes green
LED lights up yellow
LED flashes yellow
LED flashes red
LED lights up green
LED lights up yellow
LED flashes yellow
(0.5 Hz)
LED lights up red
4.2 Operator control and display elements
Meaning
At least one fault is active (e.g. RESET, watchdog monitoring etc.)
or the MCU is powering-up.
Not assigned (SINAMICS boot error).
The MCU powers up.
Firmware update is complete for components. Wait for POWER ON
for the components in question.
NC ramped up and everything in cyclic mode
CP not ramped up / started
Communication via CP possible (RUN operating state)
Communication possible (no configuration)
CP was stopped via PLC/TIA. No communication.
Configuration received and transition to the RUN operating state.
Error status (FATAL error)
Everything OK.
Software-related fault is pending, e.g. at PLC, HMI, Linux. Gener‐
ate the diagnostic data wit the Diag button and so contact the Hot‐
line.
The data backup operation initiated with the Diag button is running.
HW-related tests fail, e.g. memory test during switch on.
If no change occurs after multiple switch off/on, replace the device.
Description
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