When using zencontrol smart devices in conjunction with a zencontrol building control system the smart devices can be configured to take control on the lighting in a multi-master configuration should the control system be removed or becomes non responsive. This distinctive feature provides redundancy control within a building environment. 

The user has the flexibility to set the fallback time, which determines the duration of controller absence before the smart devices initiate the fallback mode. Additionally, when the smart device transitions to multi-master mode, the installer can configure it to recall the last active level or any level they desire, ensuring that the lighting or other controlled elements resume their previous state. 

This functionality guarantees continuous and reliable operation even in the event of control system issues, contributing to the overall resilience and dependability of the building control system.