Westermo ODW-610-F2 - Manual (Page 9)

9 6651-22611
… Recovery from faulty status
• ODW-610-F2 will automatically recover to the previous operating status when a
failure disappears. This involves recovery from multidrop 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.
Multidrop via fibre optical network
The electrical PROFIBUS DP network is transferred via the fibre optic network to the
electrical ports of all units. If ODW-610-F2 is connected to two optical fibre links (mid
unit) converted data will be transmitted in both directions, via both CH 1 and CH 2.
With only one optical fibre link (end unit) converted data will be transmitted in one
direction, via CH 1 only. Data received from one ODW-610-F2 optical fibre port will
be repeated through the other optical fibre port and it will also convert the frame to
PROFIBUS DP data and send it via the electrical port.
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
CH 2 CH 1
PROFIBUS DP
CH 2 CH 1
PROFIBUS DP
Master, unit
m
Slave, unit
s
CH 2 CH 1 CH 2 CH 1
PROFIBUS DP PROFIBUS DP
Failure Corrective action Indications
Fibre interruption ring A, TX Switch to ring B On: FL R
Fibre interruption ring A, RX Switch to ring B On: FL L
Fibre interruption ring A, RX & TX Switch to ring B 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) Switch to multidrop application* On: FL L &/or FL R
Low power on the receiver
(May indicate bad fibre) FLL flicker
* Regarding functionality see chapter “multidrop application”