Westermo ODW-632 User Manual
Page 10
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Failure
Indications
Fibre interruption ring A, TX
On: FL R
Fibre interruption ring A, RX
On: FL L
Fibre interruption ring A, RX & TX
On FL L
Fibre interruption ring B, TX
On: FL R
Fibre interruption ring B, RX
On: FL L
Fibre interruption ring B, RX & TX
On: FL L
Fibre interruption ring A and B (e.g. CH1 or CH2 both TX & RX)
On: FL L &/or FL R
Low power on the receiver
(May indicate bad fibre)
FLL flicker
* Regarding functionality see chapter “multidrop application”
… Recovery from faulty status
• ODW-632 will automatically recover to the previous operating status when a failure
disappears. This involves recovery from multi drop application to Redundant ring A/B
when ring is up and running and recovery from Ring B to Redundant ring A when
the ring is up and running.
• The time to recover from the failure status depends on total length of fibre ring.
This is typically 40–500 ms. During that time the transferred data frames should be
seen as corrupted or missed.
Serial data transfer can be set in two modes:
Synchronous mode: Transfer special protocols such as Manchester coded protocol.
See special switch settings on page 25.
Asynchronous mode: Data will be sent over the fibre optic network when a startbit
has been identified. The data rate and number of data bits should be set by DIP-switches.
the turning time (from sending serial RS-485 data until changing to receive mode) is
automatically calculated from the DIP-switch setting.
• When the ODW-632 unit connected to the PLC slave receives the slave frame (the
same frame that has been transmitted by this unit), or after a timeout, data conver-
sion at this unit will be allowed again.
… Behaviour under faulty conditions
• Elapsed time from any kind of failure at the fibre optic network until data exchange
after a corrective action depends on total length of fibre ring.
This is typically 40–500 ms (local unit). During that time, the transferred data frames
should be seen as corrupted or missed.
Note: Be ware of that full duplex will not work in redundant ring.