Westermo ODW-630-F2 - Manual (Page 8)

8 6651-22651
Designed for harsh environments, such as industrial,
road and railway applications
ODW-630-F2 complies with standards for industrial environments and railway
signalling and telecommunications apparatus. Additionally, the wide climatic range
of the ODW-630-F2 allows it to be installed in out-door cabinets without any
additional measures, such as heating, etc.
Redundant ring via fibre optical network
Under normal operation the serial data is sent over ring A. Should a fault be detected on
the fibre ring then the data will be carried on rings A and B.
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
Master, unit Slave, unit
CH 2 CH 1 CH 2 CH 1 CH 2 CH 1 CH 2 CH 1
Ring A
Ring B
M S
PLC PLC
Ring A Ring A Ring A
Ring A
Ring B Ring B Ring B
Ring B
Note! Ring A start up at TX (channel 1) and ring B ends up at RX (channel 1).
… Normal operation, data exchange between serial master and slave.
• ODW-630-F2 unit connected to the PLC-master receives serial data at the electrical
port, it converts and transfers this master frame via the fibre ring A. At this unit the
repeating of transferred frames is stopped until this transferred master frame has
returned via ring A.
This master frame will be repeated through fibre ring A by all the other units. Each
of these units will also convert the master frame to serial data and send it via the
electrical port.
• ODW-630-F2 unit to which the addressed Slave is connected, receives serial data
from the Slave. This unit converts slave data and transfers the slave frame via ring A.
The repeating of transferred frames is stopped until this transferred slave frame has
returned via ring A.
• When the “first” ODW-630-F2 unit receives the master frame (the same frame
that has been transmitted by this unit), or after a timeout, data conversion at will
be allowed again. The received slave frame will be converted and transmitted at the
electrical port.