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Siemens Building Technologies CM2N8882en / 02.2000

Landis & Staefa Division 1/8

882

VISONIK

I/O module points

Function sheet

All information points in a VISONIK system establishing a connection between the

building services system and the BPS by means of I/O modules and P-bus are

called "I/O module points". They fulfil the physical basic functions: Signalling,

measuring, counting, and positioning.

The following illustration shows a few typical I/O module points:

MLST

BPS

P-bus

I/O modules

Point types

8882Z01E

I/O module points and I/O modules in VISONIK are differentiated by their physical basic

functions and the information in data points is imaged from the associated point type.

The I/O modules transform the signals of the associated transmitters in the plant to

uniform signals of the BPS and vice versa. The following table provides an overview of

the points and signals:

I/O module points Point

type

Signal Transmitter in the plant (examples)

Signalling points ML Digital Input Contact for frost protection thermostat

Measuring points MW Analogue Input Resistance signal from the sensor

Counting points ZW Counter Input Counting pulse transmitter for flow

Switching points SB Digital Output Switching contactor for fan

Positioning points SE Analogue Output Fan actuator with positioning input of

0..10 V

The following pages contain descriptions of the individual I/O module points.

Use

Example

Explanation

Summary of content (8 pages)

PAGE 1
8 882 VISONIK® I/O module points Function sheet All information points in a VISONIK system establishing a connection between the building services system and the BPS by means of I/O modules and P-bus are called "I/O module points". They fulfil the physical basic functions: Signalling, measuring, counting, and positioning.
PAGE 2
Signalling points Definition Signalling points are digital input information points. Any status changes directly result from the processes in the building services system. Signalling points are also referred to as digital input (DI) points. Design On the building services system side, the signalling points correspond to the contacts of field devices such as thermostats, flow monitors, level monitors, etc. They supply the binary input information 0 or 1 to the automation station.
PAGE 3
Measuring points Definition Measuring points are analogue input information points. Any status changes directly result from the processes in the building services system. Measuring points are also referred to as measured value points or analogue input (AI) points. Design For measuring points, the measured value transmitters are located in the plant. These transmitters supply analogue (modulating, continuous) measuring signals in the form of electrical resistance, current, or voltage signals.
PAGE 4
Counting points Definition Counting points are digital input information points. Any status changes directly result from the processes in the building services system. Counting points are also referred to as counter value points or counter input (CI) points. Design Counting points have transmitters in the plant supplying a pulse sequence to the automation station. In this regard, each pulse is proportional to a specific volume of a physical variable or quantity.
PAGE 5
Switching points Definition Switching points are digital output information points. Any status changes result from operator input and program processes. Switching points are also referred to as switching command points or digital output (DO) points. Design On the plant-side, the switching points consist of: • One or several electrically switchable elements such as a switching contactor for pumps, fans, etc.
PAGE 6
Positioning points Definition Positioning points are analogue output information points. Any status changes result from operator input and program processes. Positioning points are also referred to as positioning command points or analogue output (AO) points. Design Positioning points in the plant • Primarily consist of electric actuators for modulating or three-position control such as valve and air damper actuators. These are common positioning signals: − Modulating voltage signals (e.g. B. 0..
PAGE 7
Transfer of module point information Communication partner, overview The module point information processed in the VISONIK BPS can be transmitted to the communication partners on various levels.
PAGE 8
 2000 Siemens Building Technologies Ltd. CM2N8882en / 02.