Westermo ODW-641 - Manual (Page 22)

22 6650-2291
About the interfaces
Power
The power terminal has two independent inputs, +VA and +VB, allowing redundant
power input. The ODW-641 power supply is galvanically isolated from all other inter-
faces.
Optical fibre interfaces
ODW-641 uses Small Form Factor Pluggable (SFP) transceivers. This means that a wide
range of different fibre transceivers and connectors can be used (see page 13).
PROFIBUS DP interface
The PROFIBUS DP interface is a female 9-position D-sub. Pin assignments are compli-
ance with the PROFIBUS standard EN 50 170.
Status port
The status port connects to an internal relay witch may be used to trigger an external
alarm if a fault condition occurs. During normal operation pins 1 and 2 are in contact
with each other, and pins 2 and 3 are isolated. During an optical link failure, or power
failure, pins 1 and 2 are isolated, and pins 2 and 3 are in contact with each other.
Optical link failures can be classified in to two categories, local or remote, as indicated by
the FL L and FL R LED’s. A local link failure is when an optical link is down at this par-
ticular unit. A remote link failure is when an optical link is down at some other unit.
From the factory, the status port is set to trigger on both types of link failures. However,
by setting DIP-switch S1:1 to the ON position, the status port will only trigger when a
local link failure has occurred.
Note: Setting DIP-switch S1:1 ON is only applicate if using the ODW-641 togheter with
ODW-642 in a multidrop network.