Westermo ODW-622 - Manual (Page 10)

10 6650-2234
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
… Recovery from faulty status
• ODW-622 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.
• When the “first” ODW-622 unit receives the master frame (the same frame that has
been transmitted by this unit), or after a timeout, data conversion will be allowed
again. The received slave frame will be converted and transmitted at the electrical
port.
• When the ODW-622 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.