Description of the device
2.3 Properties and functions
Optical link module
12 Operating Instructions, 01/2020, C79000-G8976-C270-06
Note
BFOC
BFOC stands for Bayonet Fiber Optic Connector. This connector type is functionally
compatible with ST
®
connectors. ST is a registered trademark of the AT&T company.
Note
PCF
PFC stands for Polymer Cladded Fiber and is synonymous with HCS
®
. HCS
®
is a trademark
-Bickford Optics Company.
Basic functions
There is a measurement output available for every channel at which the optical input level
can be measured with a commercially available voltmeter.
The various error and disruption messages of the OLM are available as a group signal via a
signaling contact for further processing. The signaling contact is a relay with floating
contacts.
The individual modes as well as error/fault messages are displayed by several multicolor
LEDs on the front panel of the device, refer to the section "LED display (Page 13)".
The mechanical construction consists of a compact, stable metal housing that can be
mounted either on a DIN rail or on a mounting plate.
The modules are configured using switches that are easily accessible from the outside.
The PROFIBUS OLMs comply with the standard EN 50170 /2/ and with the technical
guideline "Optical transmission technology for PROFIBUS" published by the PROFIBUS
User Organization PNO.
OLM / G12 and OLM / G12-EEC have the same function. They only differ in the specification
of the ambient climatic conditions: While the OLM / G12 is suitable for use in the standard
temperature range from 0 °C to 60 °C, the OLM / G12-EEC (extended environmental
conditions) can be used in the extended temperature range of -25 °C to +60 °C and in up to
100% humidity (condensing).
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