L-DALI User Manual 360 LOYTEC
Version 5.2 LOYTEC electronics GmbH
Off-Delay: Delay between detection that all DALI ballasts are at 0% and entering
standby mode (switching off mains). Using smaller value increases the energy saving
potential, but might decrease ballast life-time.
On-Delay: Typical delay between commanding the mains to be switched on (via the
corresponding data point) and the time the ballast is powered up and reacting to dim
commands. Modify this value if you observe all ballasts on the channel briefly
switching on when mains are turned on.
Note: The On-Delay includes the delay due to communication via BACnet or CEA-709
respectively, the delay in the IO-module for switching the relay and the ballast startup time.
The ballast startup time typically is below 500 ms (required by IEC 62386). If the On-
Delay is too short, some ballasts might not be ready. They therefore will miss the startup
sequence and will go to their POWER ON LEVEL. If the On-Delay is too long, switching
on lights when returning from standby mode will be delayed longer than necessary.
Alternatively, the same functionality is offered by special DALI devices (e.g. Tridonic PS2
standby). Set the Mains-Off handling mode of the channel to External if using such a
device.
8.5 XML-DA OPC Server
8.5.1 Access Methods
LOYTEC devices with the built-in OPC server can expose data points over a Web service.
The OPC tag namespace is built from the data point hierarchy, which has been configured
by the Configurator software. The OPC server on the device implements the data access
standard via the Web service interface XML-DA. The OPC XML-DA Web service is
accessible via the URI
http://192.168.1.100/DA
where the IP address has to be replaced with the actual IP address of the device. The Web
service is accessible over the same TCP port as the Web server. The default TCP port is 80.
The Web server port can only be changed via the device configuration tab in the
Configurator (see Section 7.16.2) or in the L-Config tool (see NIC User Manual [3]).
Since the Web service is easily routable on the Internet, the embedded OPC server
implements the basic authentication method to protect the system from unauthorized access.
The basic authentication involves the operator user and the password configured for this
user. On how to configure the operator’s password, please refer to Section 5.1.
To disable the basic authentication, clear the operator’s password.
Note: It is highly recommended to use basic authentication when exposing crucial data points
over the Web service.
To use the exposed OPC data points, there exist several possibilities:
Use LOYTEC’s L-WEB visualization tool that comes free with any LOYTEC device,
use LOYTEC’s L-VIS device as OPC XML/DA client, or
use a standard OPC client or SCADA package, or
create your own Web service client with custom Web Pages.
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