Westermo ODW-620-F2, User Manual

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9 6651-22631
Data rate up to 250 kbit/s
ODW-620-F2 converts data using rates from 300 bit/s up to 250 kbit/s. Retiming of
the data ensures that the correct signal form is transmitted from the ODW-620-F2
converter.
Designed for harsh environments, such as industrial, road and railway
applications
ODW-620-F2 complies with standards for industrial environments and railway
signalling and telecommunications apparatus. Additionally, the wide climatic range
of the ODW-620-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.
… Normal operation, data exchange between serial master and slave.
• ODW-620-F2 unit connected to the PLC master receives serial data at the electri-
cal 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-620-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.
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).