IEC 61850 Master3.About this section3.1.This document describes how IEC 61850 data objects according to IEC 61850-7-3 aremapped to OPC nodes and item tags.In general it is done by using an OPC node to represent an IEC 61850 object, and OPCitem tags to represent the attributes of the object. Most objects are single-level (that is,use only on node) but some are hierarchical and use several nodes.This section provides reference information about the following issues:• IEC 61850 data object modeling• IEC 61850 OPC Server data object modeling• Attributes• Status codesIEC 61850 OPC server data object modeling3.2.Common data attribute types3.2.1.The following sections describe how the IEC 61850 data object attributes and servicesare presented on the OPC server name space.The columns in the tables have the following content types:• Name specifies the OPC item name of the attribute or service.• Type specifies the IEC 61850 type of the attribute.• Value/Value range specifies the allowed values and ranges of the attribute or service.• Mandatory/Optional specifies whether the attribute is considered as mandatory oroptional according to the IEC 61850 standard.• OPC data type specifies the OPC data type used for the OPC item.• Bit specifies how many bits the attribute takes.• Description describes the data type and access and gives useful information.IEC 61850 quality3.2.2.The following table defines the mapping of quality in MMS (IEC 61850 7-3). Only 14bits (LSB) in quality are valid.241MRS758690COM600 series 5.0Master Protocols (Ethernet) and Applications Technical Refer-ence Manual
