User Manual

Siemens
Building Technologies
NK823x
This workbook describes the objects provided by the Siemens OPC Data Access Server to represent the
NK823x
Legend
ID Object Model Description
<ID>
<Object Model>
OPC Item PresentValue
OPC Item Mode
Result State
1 - Activate 2 - 5 - 6 -
0-Quiet 1-Normal Normal
X
1-Pre Alarm 1-Normal Pre Alarm
16-Abnormal 1-Normal Anomaly
2-Alarm 1-Normal Alarm
Notes
To identify the Object Model of each object instance, open the CSV export file with a spreadsheet program and refer to the Object Model column (See also Example of
Exported CSV File in section OPC Server of the online help).
In the OPC inteface, the physical object is represented by an instance of an Object Model that contains PresentValue and Mode properties represented by two VT_UI4
OPC Items. An approprate combination of these two values defines the real state of the instance (result state). When a command is issued, it acts on the Mode property
only. This results in changing the state of the instance.
<Description>
States
Commands on OPC Item Mode
The Object Model defines the states and commands of all instances of that type. In particular, an Object Model virtualizes a class of physical objects (devices and points
in the system) by means of specific properties.
OPC DA Specifications_V3.0_NK823X.xlsx Page 2 of 20