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Devices for Special Applications

Lighting

Switch/dimming actuators

5/8

Siemens ET G1 · 10/2008

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Overview

DALI – simple and easy to manage

Digital Addressable Lighting Interface (DALI) was launched on

the market in 2004 as a substitute for the classic 1 ... 10 V interface

and is an interface definition for the control of up to 64 DALI

devices, primarily ECGs, over a control device that acts as a

master.

DALI communication enables the simultaneous control of all

DALI devices using the same command (broadcast). In the

event of control via broadcast, all DALI devices behave as if they

are being mutually controlled over a 1 ... 10 V interface. As a

second control option, DALI supports the assignment of a DALI

device to one of up to 16 groups (group addressing).

DALI also allows the control of each DALI device individually

(individual addressing). Individual addressing means that the

control device can be interrogated for the failure of a lamp or

ECG as well the switching status and current dimming value.

This means that the operating state of each lamp group and

even each lamp is constantly available to higher-level systems.

DALI supports assignment of DALI devices to up 16 scenes. The

specific settings for each scene are stored in the individual DALI

devices and can be called up by a single command. This allows

even complex scenes or very fast command sequences to be

called up. The cost of dimming with KNX and DALI is no higher

than 1 ... 10 V.

Comparing the degree of cabling required for DALI and for

1 ... 10 V, and the difference in cost for material and labor, the

cost of implementing a project with DALI is approx. a third

cheaper than when using 1 ... 10 V.

In the simplest of cases, a control device for light control with

DALI can comprise a brightness sensor, a presence detector or

a combined brightness sensor/presence detector, which can

control a group of lamps - depending on occupancy and daylight.

With these simple local applications, where DALI is used by sensors

as an interface to one or more DALI devices, the broadcast

method is used instead of the classic control method over

1 ... 10 V. As such, these applications are not to be regarded as

a networked system.

More high-performance control devices, such as the GE 141

EIB-DALI interface or the N141

instabus

/DALI-Gateway from

Siemens, tap into all the options offered by DALI.

Compare 1 ... 10 V control to DALI

KNX/DALI

1 ... 10 V control

Switch/dimming actuators

24 V DC

230 V AC

ECG

DALI ECG

I2_14024

KNX

1 ... 10 V

DALI

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