Flowire CCo

One of the Flowires in a cluster must be CCo - Central Coordinator. CCo is essentially a bus master. By default the Flowires automatically negotiate by them selves who is to be CCo.

By cluster we mean Flowires on a physical bus that share NMK - Network Membership Key. If several NMKs are used, each "NMK-group" will have its own CCo.

But if there is more than two Flowires in a cluster it can make a difference which Flowire is the CCo. If the CCo Flowire is lost, then the communication in the whole cluster will stop for several seconds until a new CCo is agreed up on. Therefore it is best that a rack-side Flowire is CCo, so that a endpoint-side Flowire out in the field can be lost without affecting the rest of the cluster.

Since Flowire SW version 4.1.3.10 it is possible to configure CCo mode, under the section "Configured PLC Role".