Use of symbols1.7.This publication includes warning, caution, and information icons that point out safety-related conditions or other important information. It also includes tip icons to point outuseful information to the reader. The corresponding icons should be interpreted as follows.The electrical warning icon indicates the presence of a hazardwhich could result in electrical shock.The warning icon indicates the presence of a hazard whichcould result in personal injury.The caution icon indicates important information or warningrelated to the concept discussed in the text. It may indicatethe presence of a hazard which could result in corruption ofsoftware or damage to equipment or property.The information icon alerts the reader to relevant facts andconditions.The tip icon indicates advice on, for example, how to designyour project or how to use a certain function.Terminology1.8.DescriptionTermAn abnormal state of a condition.AlarmAn OPC service for providing information about alarms andevents to OPC clients.Alarms and Events; AEAn OPC service for providing information about process data toOPC clients.Data Access; DAPart of a logical node object representing specific information,for example, status, or measurement. From an object-orientedpoint of view, a data object is an instance of a class data object.DOs are normally used as transaction objects; that is, they aredata structures.Data Object; DO81MRS757275COM600 series, version 4.1IEC 61850 Proxy Server User's Manual