User Manual

Siemens Building Technologies CM2N8890en / 01.05.02

Building Automation 1/2

890

VISONIK

Event-dependent BPS functions

Function sheet

A building automation and control system must react with predefined functions

to certain events. In VISONIK, the BPS handles automation level events and, if

programmed, forwards to the management station.

Events change states. As a rule, all BPS point types can react to events. Event

processing is explained below based on a sample for I/O module points and point

types. We distinguish between the following:

• Input points: Signaling (ML), measuring (MW), counting (ZW). They transmit change

of states from the plant and indicate to the BPS that events have occurred.

• Output points: Switching (SB), positioning (ST). They create events if the BPS issues

switching or positioning commands to the plant.

MLST SB MW

BPS

P-bus

8890Z01en

I/O modules

I/O module points

Events

Reactions

For example, the following events can be communicated via the I/O module points:

– Positioning command point ST issues a positioning command change to the valve.

– Counter value point ZW indicates the volumetric flow for synchronization pulses.

– Signaling point ML indicates the fault state of the status contact FROST.

– Switching command point SB switches on or off the valve.

– Measured value point MW acquires the change of supply air temperature.

The BPS triggers event-dependent functions, or reactions, if events are transmitted or

created. Reactions may be: Plant manipulations, report output, alarm triggers, reaction

picture creation on INSIGHT, opening of telephone connection, etc..

Use

State changes and I/O

module points

Examples for events

Reactions

PAGE 1
8 890 VISONIK® Event-dependent BPS functions Function sheet A building automation and control system must react with predefined functions to certain events. In VISONIK, the BPS handles automation level events and, if programmed, forwards to the management station. Use Events change states. As a rule, all BPS point types can react to events. Event processing is explained below based on a sample for I/O module points and point types.
PAGE 2
Functioning Two reaction tasks The BPS has two reaction tasks for event handling: • TSK 253 for reactions due to EMC changes. Parameter EMV = Event Main Value, i.e., the main value for triggering the event. • TSK 252 for reactions triggered by changes to the ERSTA (error status) and OPSTA (operating status) parameters. Reaction task TSK 253 As a rule, all data points can be parameterized to start TSK253 in the case of EMC changes.