Basic System Concepts

Glossary of the System

Term	Description
Data Server	Connection to a specific DDE, OPC, or SCADA system.
Data Tag	Object representing data on a server.
Alarm	Represents an instance of a data tag at a specific time when its value triggers an alarm condition.

Basic Data Concept in the System

A data server contains multiple tags.

Alarm Concepts

The system automatically controls and monitors building services plants. Events occur (such as a fault) that are important for the operator, requiring user intervention. The alarm system processes such events and reports them accordingly.

The system reacts automatically to a fault with a system reaction (for example, automatically locking a ventilation plant during a fire alarm).

For control deviations such as a dirty filter, a simple alarm is triggered and only an alarm message is sent.

The system switches to an alarm state for both cases and a corresponding alarm is issued. After trouble-shooting the cause of the alarm, the user resets the alarm state and the system returns to normal status.

Standard Alarm Process

More important alarms (for example, lack of water) must be acknowledged. After the alarm state is eliminated, the plant is once again released after acknowledgement.

Transitory Alarm Process

Transitory alarms do not require you to reset; they simply return to the normal state when the alarm is acknowledged.