20.19.2 Function blocksDOSFRNTLINKUPWARNINGALARMIEC09000749-1-en.vsdIEC09000749 V1 ENFigure 516: DOSFRNT function blockLINKUPWARNINGALARMDOSLANABIEC13000308-1-en.vsdIEC13000308 V1 ENFigure 517: DOSLANAB function blockLINKUPWARNINGALARMDOSLANCDIEC13000309-1-en.vsdIEC13000309 V1 ENFigure 518: DOSLANCD function block20.19.3 SignalsTable 873:DOSFRNT Output signalsName Type DescriptionLINKUP BOOLEAN Ethernet link statusWARNING BOOLEAN Frame rate is higher than normal stateALARM BOOLEAN Frame rate is higher than throttle stateTable 874:DOSLANAB Output signalsName Type DescriptionLINKUP BOOLEAN Ethernet link statusWARNING BOOLEAN Frame rate is higher than normal stateALARM BOOLEAN Frame rate is higher than throttle stateTable 875:DOSLANCD Output signalsName Type DescriptionLINKUP BOOLEAN Ethernet link statusWARNING BOOLEAN Frame rate is higher than normal stateALARM BOOLEAN Frame rate is higher than throttle stateSection 20 1MRK502052-UEN BBasic IED functions1138Technical manual