11.3 Logic rotating switch for function selection andLHMI presentation SLGAPC SEMOD114936-1 v411.3.1 IdentificationSEMOD167845-2 v3Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberLogic rotating switch for functionselection and LHMI presentationSLGAPC - -11.3.2 Application SEMOD114927-4 v6The logic rotating switch for function selection and LHMI presentation function(SLGAPC) (or the selector switch function block, as it is also known) is used to geta selector switch functionality similar with the one provided by a hardware multi-position selector switch. Hardware selector switches are used extensively byutilities, in order to have different functions operating on pre-set values. Hardwareswitches are however sources for maintenance issues, lower system reliability andextended purchase portfolio. The virtual selector switches eliminate all theseproblems.SLGAPC function block has two operating inputs (UP and DOWN), one blockinginput (BLOCK) and one operator position input (PSTO).SLGAPC can be activated both from the local HMI and from external sources(switches), via the IED binary inputs. It also allows the operation from remote (likethe station computer). SWPOSN is an integer value output, giving the actual outputnumber. Since the number of positions of the switch can be established by settings(see below), one must be careful in coordinating the settings with the configuration(if one sets the number of positions to x in settings – for example, there will beonly the first x outputs available from the block in the configuration). Also thefrequency of the (UP or DOWN) pulses should be lower than the setting tPulse.From the local HMI, the selector switch can be operated from Single-line diagram(SLD).11.3.3 Setting guidelines SEMOD115063-294 v6The following settings are available for the Logic rotating switch for functionselection and LHMI presentation (SLGAPC) function:Operation: Sets the operation of the function On or Off.NrPos: Sets the number of positions in the switch (max. 32).1MRK 504 169-UEN A Section 11ControlTransformer protection RET650 2.2 IEC 235Application manual
