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Fibre Operation

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Primary Fibre Failed Operation

If a primary fibre is damaged (e.g. between Slaves 3 and 4 as shown below). The unit beyond the break (4) will start re-transmitting messages received on its secondary fibre input on both of its fibre outputs thus ensuring that all units can still communicate with the master. As soon as the fault is rectified all units will return to normal operation.

Secondary Fibre Failed Operation

If a secondary fibre is damaged (e.g. between Slaves 3 and 4 as shown below). The unit beyond the break (3) will start re-transmitting messages received on its primary fibre input on both of its fibre outputs thus ensuring that all units can still communicate with the master. As soon as the fault is rectified all units will return to normal operation.

Both Fibres Failed Operation

If both fibres are damaged (e.g. between Slaves 3 and 4 as shown below). Each unit beyond the break will start to transmit the data received on the working fibre input on both of its fibre outputs. In the diagram below Slave 4 will return secondary data via the primary fibre and Slave and Slave 3 Primary data via the secondary. As soon as the fault is rectified all units will return to normal operation.

Unit Failed Operation

Should a slave unit fail (Slave 3 in the diagram below) the slaves either side of the failed unit will start

re-transmitting messages on both fibres as in the case of both fibres failing.

Primary Master Failed Operation

The iKON system can operate with dual master units. In normal operation the primary master unit controls the fibre system, the secondary master will operate in the same manner as a normal slave unit. If the primary master fails the secondary master will take control of the fibres. The slave units either side of the primary master will start to re-transmitting data on both of their fibre outputs, as shown below.

Normal operation

In normal operation the "master" unit will transmit identical messages on both fibres. Each slave unit will re-transmit primary messages on its primary fibre output and secondary messages on it's secondary output. Thus the message is passed from unit to unit and finally back to the master.


Normal operation Primary Fibre Fail Secondary Fibre Fail Both Fibres Fail Unit Fail Master Fail

All the iKON fault tolerant fibre system use dual fibre loops. These loops operate in opposite directions, i.e. clockwise and anticlockwise. Both fibres are continuously monitored even when a loop is in it's passive state, ensuring that if the primary fibre fails the secondary fibre will be operational when the system swaps over. In the extremely unlikely even of the failure of a unit will result in only that units functions failing the remaining system will continue to operate normally. Even the failure of the system master can be coped with on systems fitted with dual masters. To see how the system reconfigures its self click on the buttons below.