The DALI DT1 'Inhibit' (or 'Rest Mode') temporarily disables an emergency luminaire during planned building maintenance, avoiding spurious tests during the intervention; the gear returns automatically to normal mode after a timeout.
True
Inhibit / Rest Mode is used for planned electrical maintenance with scheduled mains outages. Without it, every outage triggers the emergency luminaires, discharging their batteries ten times faster than usual and raising false alarms. Activation is either manual (by a technician) or automatic (via schedule). A safety timeout returns the gear to normal mode after N hours (typically 8 h max) to prevent forgotten inhibits, and the audit log records every inhibit event.
Never disable the inhibit timeout 'temporarily' — a forgotten manual inhibit means the emergency luminaires are silently non-compliant until next discovery, which is an insurance liability.
DALI-2 bank in preparation
The full DALI-2 bank isn't available yet. Drop your email to get notified at launch and grab an early-bird discount.
Join the waitlist →See the 9 other DALI-2 practice questions
Related questions
- DALI-2 (IEC 62386 Edition 2, 2014+) is the major evolution of DALI v1, adding native support for input devices (sensors, push-buttons) directly on the DALI bus itself, together with a product certification programme administered by the DALI Alliance (DiiA).1. Architecture · DALI vs DALI-2
- The DALI bus uses a polarity-free twisted pair (no + / - orientation), with Manchester coding at 1 200 baud over a nominal 22.5 V DC supply, and is allowed to share the same multi-core cable as the 230 V mains feeding the luminaires.1. Architecture · Physikalische Schicht
- Self-contained emergency luminaires (DT1) under DALI-2 support standardised commands for the monthly function tests and annual duration tests required by EN 50172, and these tests can be automated from a central DALI-2 controller.2. Devices · Typ 1 Notbeleuchtung
- DALI-2 supports several application controllers active on the same bus (multi-master), with an arbitration mechanism that prevents conflicts when two controllers try to command the same control gear at the same time.4. Application Controllers · Multi-Master
- DALI bus power supplies are typically available at 100, 120, 150 or 250 mA depending on the vendor (ABB BCO/S, Tridonic DALI-PS, Lunatone PS5), and should be sized for the cumulative current of control gear plus input devices, with a 30 percent margin.7. Best practices · Bus-Netzteil