Terminology - ABB COM600S User Manual

1.8.
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COM600 series, Version 4.1
Modbus TCP Master (OPC) User's Manual
The electrical warning icon indicates the presence of a hazard
which could result in electrical shock.
The warning icon indicates the presence of a hazard which
could result in personal injury.
The caution icon indicates important information or warning
related to the concept discussed in the text. It may indicate
the presence of a hazard which could result in corruption of
software or damage to equipment or property.
The information icon alerts the reader to relevant facts and
conditions.
The tip icon indicates advice on, for example, how to design
your project or how to use a certain function.

Terminology

Term
Alarm
Alarms and Events; AE
Data Access; DA
Data Object; DO
Data Set
Device
Event
Description
An abnormal state of a condition.
An OPC service for providing information about alarms and
events to OPC clients.
An OPC service for providing information about process data to
OPC clients.
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.
The data set is the content basis for reporting and logging. The
data set contains references to the data and data attribute val-
ues.
A physical device that behaves as its own communication node
in the network, for example, protection relay.
Change of process data or an OPC internal value. Normally, an
event consists of value, quality, and timestamp.
1MRS756445