ABB COM600 series User Manual - Terminology

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Terminology

1.8.

Description

Term

An abnormal state of a condition.

Alarm

An OPC service for providing information about alarms and

events to OPC clients.

Alarms and Events; AE

An OPC service for providing information about process data to

OPC clients.

Data Access; DA

Part of a logical node object representing specific information,

for example, status, or measurement. From an object-oriented

point of view, a data object is an instance of a class data object.

DOs are normally used as transaction objects; that is, they are

data structures.

Data Object; DO

The data set is the content basis for reporting and logging. The

data set contains references to the data and data attribute val-

ues.

Data Set

A physical device that behaves as its own communication node

in the network, for example, protection relay.

Device

Change of process data or an OPC internal value. Normally, an

event consists of value, quality, and timestamp.

Event

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1MRS756445

COM600 series, Version 4.1

Modbus TCP Master (OPC) User's Manual