defined in the IED. Otherwise the default authority level, SuperUser, can handle thecontrol without LogOn. The users and passwords are defined in PCM600.12.3 Interlocking12.3.1 FunctionalityThe interlocking functionality blocks the possibility to operate high-voltageswitching devices, for instance when a disconnector is under load, in order to preventmaterial damage and/or accidental human injury.Each control IED has interlocking functions for different switchyard arrangements,each handling the interlocking of one bay. The interlocking functionality in each IEDis not dependent on any central function. For the station-wide interlocking, the IEDscommunicate via the station bus or by using hard wired binary inputs/outputs.The interlocking conditions depend on the primary bus configuration and status of anybreaker or switch at any given time.12.3.2 Logical node for interlocking SCILO12.3.2.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberLogical node for interlocking SCILO - 312.3.2.2 FunctionalityThe Logical node for interlocking SCILO function is used to enable a switchingoperation if the interlocking conditions permit. SCILO function itself does notprovide any interlocking functionality. The interlocking conditions are generated inseparate function blocks containing the interlocking logic and provides SCILO itsinput.12.3.2.3 Function blockSCILOPOSOPENPOSCLOSEOPEN_ENCLOSE_ENEN_OPENEN_CLOSEIEC09000083.vsdIEC09000083 V1 ENFigure 179: SCILO function block1MRK 502 048-UEN A Section 12Control355Technical manual
