Data Sheet for Product

Siemens
Smart Infrastructure
STT20/STT11 Fire Panel
This workbook describes the objects provided by the Siemens OPC Data Access Server to represent the
STT20 and STT11 fire control unit
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
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.
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).
<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_V5.1_STT20-STT11.xlsx Page 2 of 30