Siemens ESM

Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
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C79000-Z8976-C068-10
4.2 Displays and Operator Controls
The OSM/ESM has the following LED displays:
4.2.1 LED Display "Status"
The status display indicates the operating mode of an OSM/ESM:
Fault (red LED):
Status Meaning
Lit The OSM/ESM has detected an error. The signaling contact
opens at the same time. The signaled errors are described in
Chapter 4.1.7.
Not lit No errors detected by the OSM/ESM.
Stby – Standby (green LED):
This LED does not exist on the OSM TP22 and ESM TP40.
Status Meaning
Lit The standby function is activated, the OSM/ESM is in the
standby passive mode.
Not lit The standby function is deactivated.
Flashes The standby function is activated, OSM/ESM is in the standby
active mode; in other words, the master OSM/ESM has failed
and the standby OSM/ESM takes over data traffic.