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Siemens Desigo SX Open - SX Configurator, V2.1 CM110702en_06

Building Technologies Worksheets in SX Configurator 20 Mar 2012

5.2.2 BACnet section

Figure 5-14

The BACnet information has to be entered manually to define each mapped OPC

item.

In the simplest case, some (or all) OPC items are mapped to [PrVal] of the BACnet

objects.

This is the case if the following conditions apply to each OPC-item row in the

Configuration sheet:

• Item Set Ref is blank

• BACnet Device Reference exists

• Object Type is defined

• Object Instance has been entered

• Keyname exists

• Object Name exists

Column Description

BACnet Device Ref

Reference to a specific BACnet device in the BACnet Device sheet to which the

BACnet object is be assigned There are as many BACnet devices as required. For

further information, see

BACnet Object Type

Type of BACnet object. See the Objects sheet, section 5.9.

Select an appropriate object for value mapping on the BACnet side in accordance with

the OPC-side data type and access rights.

Normally, integers and real values are mapped to analog, binary and multistate

objects, and read access and write access to input and output objects respectively.

Object Instance

Instance of the object.

The instance must be unique for each object type and BACnet device, i.e. for each

device, there can be only one analog input object 1.

Keyname

This is normally identical to the BACnet object name. Governed by the Desigo Insight

naming conventions. Automatically derived from the OPC item name during OPC

import, provided the option Suggest BACnet Object Name and Keyname is enabled.

The key name is interpreted on the Desigo-side as the User Designation.

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Siemens SX Series User's Guide Page 36