Siemens ESM - Manual (Page 60)

Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
56 C79000-Z8976-C068-10
4.2.2 LED "Power"
The display mode of the "Power" LED can be switched over by briefly pressing the
"Select/Set" button on the front panel of the OSM/ESM. The valid display mode is
indicated by the display mode LEDs on the OSM/ESM.
Depending on the status of the display mode LEDs, the "Power" LED has the two
following display modes:
Display mode Meaning
Status of the power supplies
In the following states of the display mode
LEDs, the Power LEDs indicate the current
status of the two voltages of the OSM/ESM:
Display Mode
Note
LED 3 exists only on devices with digital
inputs.
Power LED L1 or L2
- Lit green; in other words, power supply 1
or 2 (line 1 or line 2) is applied.
- Not lit; in other words power supply 1 or 2
(line 1 or line 2) is less than 14 V.
LED off LED off LED off
LED off LED on LED off
LED on LED off LED off
LED off LED off LED on
3 2 1
3 2 1
3 2 1
3 2 1