GE Multilin B90 Low Impedance Bus Differential System viiTABLE OF CONTENTS10.1.2 SAMPLE BUSBAR AND DATA........................................................................ 10-110.2 ZONING AND DYNAMIC BUS REPLICA10.2.1 NORTH BUS ZONE ......................................................................................... 10-310.2.2 SOUTH BUS ZONE ......................................................................................... 10-310.3 BIASED CHARACTERISTIC BREAKPOINTS10.3.1 DESCRIPTION................................................................................................. 10-410.3.2 HIGH BREAKPOINT ........................................................................................ 10-410.3.3 LOW BREAKPOINT......................................................................................... 10-510.4 SLOPES AND HIGH SET THRESHOLD10.4.1 DESCRIPTION................................................................................................. 10-610.4.2 EXTERNAL FAULTS ON C-1 .......................................................................... 10-610.4.3 EXTERNAL FAULTS ON C-2 .......................................................................... 10-710.4.4 EXTERNAL FAULTS ON C-3 .......................................................................... 10-710.4.5 EXTERNAL FAULTS ON C-4 .......................................................................... 10-810.4.6 EXTERNAL FAULTS ON C-5 .......................................................................... 10-810.5 BUS DIFFERENTIAL SETTINGS10.5.1 DESCRIPTION................................................................................................. 10-910.6 ENHANCING RELAY PERFORMANCE10.6.1 USING SETTING GROUPS........................................................................... 10-10A. FLEXANALOG ANDFLEXINTEGERPARAMETERSA.1 PARAMETER LISTSA.1.1 FLEXANALOG ITEMS .......................................................................................A-1A.1.2 FLEXINTEGER ITEMS ......................................................................................A-3B. MODBUSCOMMUNICATIONSB.1 MODBUS RTU PROTOCOLB.1.1 INTRODUCTION................................................................................................B-1B.1.2 PHYSICAL LAYER.............................................................................................B-1B.1.3 DATA LINK LAYER............................................................................................B-1B.1.4 CRC-16 ALGORITHM........................................................................................B-2B.2 MODBUS FUNCTION CODESB.2.1 SUPPORTED FUNCTION CODES ...................................................................B-3B.2.2 READ ACTUAL VALUES OR SETTINGS (FUNCTION CODE 03/04H) ...........B-3B.2.3 EXECUTE OPERATION (FUNCTION CODE 05H) ...........................................B-4B.2.4 STORE SINGLE SETTING (FUNCTION CODE 06H) .......................................B-4B.2.5 STORE MULTIPLE SETTINGS (FUNCTION CODE 10H) ................................B-5B.2.6 EXCEPTION RESPONSES ...............................................................................B-5B.3 FILE TRANSFERSB.3.1 OBTAINING RELAY FILES VIA MODBUS ........................................................B-6B.3.2 MODBUS PASSWORD OPERATION ...............................................................B-7B.4 MEMORY MAPPINGB.4.1 MODBUS MEMORY MAP .................................................................................B-8B.4.2 DATA FORMATS .............................................................................................B-56C. IEC 61850COMMUNICATIONSC.1 OVERVIEWC.1.1 INTRODUCTION................................................................................................C-1C.1.2 COMMUNICATION PROFILES .........................................................................C-1C.2 SERVER DATA ORGANIZATIONC.2.1 OVERVIEW........................................................................................................C-2C.2.2 GGIO1: DIGITAL STATUS VALUES .................................................................C-2C.2.3 GGIO2: DIGITAL CONTROL VALUES ..............................................................C-2C.2.4 GGIO3: DIGITAL STATUS AND ANALOG VALUES FROM RECEIVED GOOSEDATAC-2C.2.5 GGIO4: GENERIC ANALOG MEASURED VALUES.........................................C-2C.2.6 MMXN: ANALOG MEASURED VALUES...........................................................C-3