Westermo ODW-730-F2 User Manual download pdf (Page 14)

6651-2255

Redundant ring, Y-mode configuration

In a redundant ring an extra fibre pair is used. This extra fibre pair is used to carry data

if one of the other fibre pairs breaks. In Y-mode mode an ODW-730 network will behave

as a 2-wire bus. I.e. all communication devices will “hear” the data sent out by other

communication devices.

Prepare the fibre optical network

RX2

TX2

Focal point

S2:2 ON

S2:3 ON

Ring member

S2:2 ON

S2:3 OFF

Ring member

S2:2 ON

S2:3 OFF

Ring member

S2:2 ON

S2:3 OFF

Device 1

Communicates

with all other devices

Device 2

Communicates

with all other devices

Redundant fibre pair. Not used under normal operation.

Device 3

Communicates

with all other devices

Device n

Communicates

with all other devices

TX1

RX1

RX2

TX2

TX1

RX1

RX2

TX2

RS-485 RS-485 RS-485

Fibre

pair

Fibre

pair

Fibre

pair

Fibre

pair

used

carry

data

FP LED

is on to

indicate

focal point

RS-485

TX1

RX1

RX2

TX2

TX1

RX1

PWR

• Configure all ODW-730 units for the correct speed and data format using DIP-

switches S1:1 – S1:7.

• Select RS-485 2 wire and 4-wire mode using DIP-switch S2:1 (OFF = 2-wire,

ON = 4-wire).

• Enable the RS-485 termination / fail-safe if required using DIP-switches S3:1 – S3:4

(S3:1 and S3:2 = 4-wire termination, S3:3 and S3:4 = 2-wire termination)

• Set DIP-switch S2:2 in the ON position (redundant ring) on all ODW-730 units.

• One, and only one, of the ODW-730 units must be configured as a Ring Focal Point by

setting DIP-switch S2:3 to the ON position. (The Ring Focal Point acts as a logical end

point in the optical fibre ring, thus forming a bus type of structure)

• Set DIP-switch S2:6 as desired. See page 34 “Status port” for more information.

• Verify that DIP-switches S1:8, S2:4, S2:5 and S2:8 are set in the OFF position.

• Connect the fibre pairs between the units. Always connect CH 1 from one unit to CH

2 on the next unit as shown in the picture above.

• Connect the power supply to all units and verify that all fibre links become active.

(CH 1 and CH 2 LED’s are on, FL L and FL R LED’s are off).

• Connect the communication devices to the corresponding ODW-730 unit.

• The network is now up and running.

Note: In an ODW-730 fibre optic network there will be some additional processing

delays that do not exist in an electrical bus. It is possible that the application must be

adjusted to accommodate these delays if using many ODW-730 units in a large network.

See page 32 “Calculating system processing delay” for more information on how to

determine the overall system delay time.

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Westermo ODW-730-F2 User Manual Page 14

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