User Manual

Siemens Building Technologies CM2N8881en / 02.2000

Landis & Staefa Division 1/2

881

VISONIK

Information points

Function sheet

In building automation and control, information points represent the data sources and

data sinks of the related process variables. Information points are identified by an

address and may contain one or several items of information. The term "information

point" in building automation and control is synonymous with "data point".

The illustration below shows an example for a VISONIK information point. All

information in the data point of type MW under the technical address $015 in the

process image of the BPS automation station is available for the basic function

MEASURING with temperature sensor T1:

°C

BPS

etc. LOL

CPNR

DPD

16.5

0xxxx

19.8

$015

.....

- Address

- Parameter

- Values / information

Information point /

data point

8301Z39E

The smallest entity containing a statement on the process variable is considered one

item of information. In VISONIK data points, the individual items of information are

contained in the various parameters in the form of values. For the above example:

Parameter Information

DPD Present raw measured value of sensor T1

CPNR Conversion set no.; here: 0 for standard conversion to sensor Ni1000

AI Analogue Input = Present, converted measured value in °C; here: 19.8,

also main value for this information point.

LOL Assigned lower limit value; here: 16.5

Use

Example for an

information point

Information

PAGE 1
8 881 VISONIK® Information points Function sheet In building automation and control, information points represent the data sources and data sinks of the related process variables. Information points are identified by an address and may contain one or several items of information. The term "information point" in building automation and control is synonymous with "data point". Use Example for an information point The illustration below shows an example for a VISONIK information point.
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Types of information points Physical and virtual points In building automation and control, we primarily differentiate between physical and virtual information points as shown in the following illustration based on two VISONIK data points: °C HW SW I/O module BPS Physical data point; here: type MW MW RGB Processing Definition and examples 8881Z02E Virtual data point; here: type RGB Physical and virtual data or information points are defined as follows: Designation Definition/Example Physical in