Reactive Power Controller Operating instructions

Reactive Power ControllerRS485 Interface (Option)Transmission protocolsTwo transmission protocols are available for the connectionto an existing field bus system:0 - Modbus RTU (Slave) and1 - Profibus DP V0 (Slave) .With Modbus protocol you can have access to the data oftable 1, and with Profibus protocol you can have accessto the data of table 2.Bus structureAll devices are connected in bus structure (line). In onesegment up to 32 participiants can be assembled. At theend and the beginning of each segment, the cable mustbe terminated by resistors. In Prophi you can activatethese resistors with two plug-ins.For more than 32 participiants you must use a repeater(line amplifier) to connect the single segments.Terminal resistorsIf Prophi is connected to the end of the bus cable, thebus cable must be terminated at this point with resistors.The required resistors are integrated within the Prophiand are activated in position ON.GNDONTermination392R 221R 392ROFF+5VB23A22ShieldingFor connections via RS485 interface, you need a protectedand twisted cable. To achieve a sufficient protectionresult, the shielding must be connected at both endsextensively to the housing or parts of the cabinet.GND10200740ProphiDiagr. Connection RS485 interface21Cable specificationsThe maximum cable length depends on cable type andtransmission speed. We recommend cable type A.Cable parameter Type A Typ BImpedance 135-165Ohm 100-130Ohm(f = 3-20MHz) (f > 100kHz)Capacity < 30pF/m < 60pF/mResistance < 110 Ohm/km -Diameter >= 0,34mm2 >= 0,22mm2(AWG22) (AWG24)Cable lengthThe following table shows the maximum cable length inmeters (m) for various transmission speed.Baud rate (kbit/s)Cable type 9.6 19.2 93.75 187.5 500 1500Type A 1200 1200 1200 1000 400 200Type B 1200 1200 1200 600 200 70Page 14= Key 1 = Key 2 = Key 3