varlogic modbus communication user manual - Schneider Electric

NRC12Modbus applicationUSER’S MANUAL9 PicturesPicture 1: One PFC system ..............................................................................4Picture 2: Two PFC in the system....................................................................5Picture 3: Correct structure of an RS-485 bus................................................6Picture 4: 2-wire connection in an RS-485 bus...............................................6Picture 5: 4 wire connection in RS-485 bus....................................................7Picture 6: Connectors and indicators in MCU ................................................9Picture 7: RS-485 pin numbers ......................................................................11Picture 10: Jumpers on MCU .........................................................................12Picture 11: Terminators and biasing in RS-485 bus.....................................13Picture 12: Installing procedure for CCA ......................................................14Picture 13: Modbus settings in the PFC........................................................21Picture 14: Menu structure of the PFC ..........................................................2210 TablesTable 1: RS-485 bus connections using 2-wire cabling.................................7Table 2: RS-485 bus connections using 4-wire cabling.................................8Table 3: RS-232 cable between the MCU and PC ...........................................8Table 4a: RS-485 port A pins..........................................................................10Table 4b: RS-485 port B pins .........................................................................10Table 5: RS-232 port pins ...............................................................................11Table 6: Jumpers on MCU ..............................................................................12Table 7: Terminators and biasing on an RS-485 bus...................................13Table 8: Value types........................................................................................15Table 9: Modbus registers, function 4...........................................................16Table 10: Modbus registers for function 3 and 6..........................................18Table 11: Step sequences ..............................................................................18Table 12: Stepping programs.........................................................................18Table 13: Alarm bits ........................................................................................19Table 14: Wiring...............................................................................................21Table 15: Modbus parameters in PFC ...........................................................22Schneider Electric Industries SASAs characteristics and dimensions of our products are constantly changing,please contact our office for confirmation.N°3653572EN-AA 11-200524