Siemens SINUMERIK ONE PPU 1740 Series - LED Display

3.2.2 LED display
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Figure 3-6 LED display
Meaning of the RUN/STOP, ERROR and MAINT PLC-LEDs
RUN/STOP LED ERROR LED MAINT LED Meaning
LED off LED off LED off
Supply voltage at the CPU not present or too low.
LED off
LED flashes red
LED off
An error has occurred.
LED lights up green LED off LED off
The CPU is in the RUN operating state.
LED lights up green
LED flashes red
LED off
Diagnostic event pending.
LED lights up green LED off LED lights up yellow
A plant maintenance request is pending.
The affected hardware must be validated/replaced
within a short interval.
Active force job
PROFIenergy pause
LED lights up green LED off
LED flashes yellow
A plant maintenance requirement is pending.
The affected hardware must be validated/replaced
within a foreseeable interval.
Configuration faulty
LED lights up yellow LED off
LED flashes yellow
Firmware update completed successfully.
LED lights up yellow LED off LED off
CPU is in STOP operating state.
LED lights up yellow
LED flashes red LED flashes yellow
The program on the SIMATIC Memory Card cau‐
ses a fault.
CPU defective
System characteristics
3.2 Operator controls and display elements
PPU 1740
28 Equipment Manual, 01/2019, A5E47615272B AA