Viconics VWZS Integration Guide - Manual (Page 8)

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Any given device / node / controller including the Jace –coordinator can ONLY give a
maximum 6 ZigBee addresses out to other devices so they join the active ZigBee network.
This means for any device / node / controller to be able to successfully join a ZigBee network,
it needs an address to be assigned by another device / node / controller which is within
connectivity and that has NOT already assigned its maximum of 6 addresses allowed.
Please note that once a device / node / controller has been assigned a ZigBee address & has
joined the active ZigBee network, it will save its assigned ZigBee address to flash memory &
re-use it afterwards even after a power failure or a network re-start. The ONLY time device /
node / controller would require a NEW ZigBee address is if the network is re-started with
either a new PAN ID or a new Channel value. This causes the currently assigned & saved
ZigBee address in flash to be erased & will force the / node / controller to try to re-join a new
network.