Distributed intelligence and multi‑master operation

Every zencontrol application controller is an independent DALI-2 controller that can run its area on its own. Controllers communicate peer-to-peer in a multi-master arrangement over standard Ethernet, so if one controller fails, the rest keep the site operating.

In normal operation, switches and sensors on the DALI line report events to the controller, which makes the logic decisions and sends commands to lighting devices. Switch LED indicators stay in sync by listening to the DALI bus and updating whenever commands are issued. Output devices (drivers, relays, etc.) don’t make decisions—they simply execute controller commands. If a controller becomes unresponsive, smart switches and sensors can enter a multi-master fallback mode and issue basic lighting commands directly, keeping lights working until the controller is replaced.

Cloud connectivity as an enhancement, not a dependency

zencontrol’s cloud services add remote commissioning, power dashboards, analytics and multi-site management, giving owners and facilities teams deeper insight and control. But the cloud isn’t required for everyday operation: critical logic is stored on the application controllers, so buildings keep running if the internet fails. Cloud features can be enabled at any time – ensuring connectivity issues never leave occupants in the dark

Optional head‑end software

zencontrol stores configuration data on the application controllers, but an optional on-site head-end is available for local management. The Onsite software package supports offline commissioning and maintenance, including fault visibility, emergency test reporting, site setup and operational settings, and plan-view management across tens of thousands of devices. It includes access-control models and runs independently of zencontrol Cloud, so no internet connection is required. Customers can choose cloud-based management, local Onsite software, or both—without creating a single point of failure.

Fallback and system‑failure modes

zencontrol smart switches and sensors can keep lights operating if an application controller fails. If a controller becomes unresponsive, smart devices can wait a configured time, then enter a multi-master fallback mode and respond to user input much like normal operation (with slightly reduced functionality). This fallback requires the DALI bus to remain powered—so the DALI power supply must keep the line energised. Systems that combine the controller and DALI power supply into one unit risk losing bus power if that unit fails, which prevents fallback. zencontrol avoids this by using independent DALI power supplies for each line, keeping the bus alive even if a controller fails.

If the DALI power supply fails and bus voltage is lost, output devices (drivers/relays) use their stored system-failure level and set themselves accordingly. Because each line has its own independent power supply, a power-supply failure is contained to that line; other lines continue operating, and remaining switches/sensors can still control any powered lines.

Independent power supplies per DALI line

Resilient lighting control depends on containing faults. zencontrol uses a dedicated external DALI-2 power supply for each DALI line, designed to power one line only. Keeping power supplies separate from controllers provides galvanic isolation between control electronics and the bus, and strong isolation between lines. On multi-channel application controllers, each channel is powered by its own supply rather than a shared PSU.

If a power supply fails, only that line is affected—other lines, controllers and smart devices continue operating. This is why combining multiple DALI channels and a single shared PSU in one enclosure is a risk: if the shared PSU fails, every line it powers goes dark and fallback becomes ineffective.

Security and reliability baked in

zencontrol uses industry-standard TCP/IP networking secured with TLS, SHA-2 hashing and AES-256-GCM. Commands and data are encrypted, authenticated and integrity-checked, with acknowledgements to confirm delivery. Devices support cryptographically signed firmware updates to address future threats. Built on internationally recognised DALI and DALI-2 standards, zencontrol avoids vendor lock-in and keeps devices compatible for years.

Rapid restoration and backup

zencontrol is designed for fast recovery as well as prevention. The Grid View commissioning interface can cut commissioning time by up to 100×, enabling installers to update settings across thousands of devices in seconds. With cloud backup and restore, integrators can rapidly repair or reinstate a DALI-2 site if configuration data is lost or devices are scrambled—often restoring even large sites in hours rather than weeks, minimising downtime.