Addressing Function Blocks; Dali_Dev_Scan - Siemens SIMATIC ET 200SP CM 1xDALI Manual

Programming

5.4 Addressing function blocks

5.4 Addressing function blocks
Addressing function blocks are used for assigning short address, identifying devices,
changing short address, or querying the address status of the DALI devices.
5.4.1

DALI_DEV_SCAN

Description
DALI_DEV_SCAN is used for scanning the DALI devices (control gears or input devices) on
the bus through random address. The address status of DALI devices are saved in CM
1xDALI (refer to data flow path 4 (Page 23)).
If a device has a short address which is unique compared to other devices, the device keeps
its short address. If a device does not have a short address or its short address is not
unique, the system assigns a new short address to it.
It takes about 6 seconds to search for one device. If there are 64 devices or more devices on
the bus, it takes more than 6 minutes.
This function block can only scan 64 devices, so if there are more than 64 devices on the
DALI bus, the result changes every period, and this result is not determinate after each
procedure. The result can be queried through function block DALI_DEV_QUERY_ADDR
(Page 37).
Note
The output resets, only if both the CANCEL and SCAN are set to 0.
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ET 200SP Communication module CM 1xDALI (6ES7137-6CA00-0BU0)
Manual, 06/2019, A5E46959434-AA