varlogic modbus communication user manual - Schneider Electric

NRC12Modbus applicationUSER’S MANUALModbus applicationUSER’S MANUAL1 Table of Contents1 Table of Contents.......................................................................................22 Glossary......................................................................................................33 NRC12 Modbus in general.........................................................................34 Entire system..............................................................................................44.1 PFC to PC connection alternatives ............................................................................. 44.1.1 One PFC..............................................................................................................................44.1.2 Many PFCs system..............................................................................................................55. Physical connections ................................................................................55.1 Fiber optic connection ................................................................................................. 55.2 RS-485 interface ......................................................................................................... 55.3 2-wire connection in an RS 485 bus............................................................................ 65.4 4-wire connection in an RS-485 bus ........................................................................... 75.5 RS-232 connector on the MCU ................................................................................... 85.6 Power supply .............................................................................................................. 86 Device descriptions ...................................................................................96.1 MCU............................................................................................................................ 96.1.1 RS-485 port and power supply ..........................................................................................106.1.2 RS-232 port........................................................................................................................116.1.3 Fiber connector..................................................................................................................116.1.4 Jumpers on MCU...............................................................................................................116.1.5 Terminators and biasing on an RS-485 bus ......................................................................136.2 PFC and CCA ........................................................................................................... 146.2.1 How to connect CCA to PFC .............................................................................................147 Modbus register map for NC-12 PFC .....................................................157.1 Modbus function 4..................................................................................................... 157.2 Modbus functions 6 and 3 ......................................................................................... 177.2.1 Parameter value tables......................................................................................................187.3 Modbus settings in the PFC ...................................................................................... 218 Technical specifications..........................................................................238.1 Safety........................................................................................................................ 238.2 Environmental conditions .......................................................................................... 239 Pictures .....................................................................................................2410 Tables........................................................................................................242