Schneider Electric VW3 A3 303 user manual Wire Jbus schematic

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9. Appendix

9. 5. 2-wire Jbus schematic

Schematic diagram:

Master

R	G
	5 V

470 Ω

0 V

L- (B/B')

150Ω

150 Ω

L+ (A/A')

	Slave 1	Slave n

Type of trunk cable	Cable with 1 shielded twisted pair
Maximum length of bus	1,300 m at 19200 bps

Maximum number of stations (without	32 stations, i.e., 31 slaves
repeater)

Maximum length of tap links	3 m

Bus polarization	One 470 Ω pull-up resistor to the 5 V
	One 470 Ω pull-down resistor to the 0 V
	This polarization is often provided in the master.

Line termination	One 150 Ω resistor

Common polarity	No

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Contents Altivar Contents Electric shock will result in death or serious injury Before you beginCommunication Parameters Manual Installation ManualDocumentation structure Programming ManualPresentation IntroductionNotation Hardware description Hardware setupInstalling the card in the drive ReceiptChoosing polarization Switch codingCoding the address 1234 AddressWiring recommendations Connecting to the busModbus RS485 standard Connection accessories Connection via RJ45 wiring systemConnection cables TSX SCP CM Connection cables for the masterType of master Master interface Description Catalog number TWD XCA RJ030Cables Connection via junction boxesDescription Catalog Number Subscriber socket RS485 double shielded twisted pairTSX P ACC TSX CSA500Communication parameters ConfigurationParameter Value Comment Control CommandControl via Modbus in I/O profile Control via Modbus or the terminals in I/O profileControl via Modbus or the terminals in Drivecom profile Control via Modbus in Drivecom profileConfiguration COM. Scanner Input Example of configuration via the graphic display terminalCommunication scanner RDY NETCOM. Fault Management Communication faultsFormat Range Terminal display CONFIG. COMM. MAPMonitored parameters FormatGreen RUN Red ERR Meaning Corrective action DiagnosticsChecking the address LEDsCOM Scan Output MAP CMD. Word Image RUN NETCommunication MAP COM. Scanner Input MAPOutput variable Scanner parameter Input variable Scanner parameterCOM Scan Output MAP Card fault Communication faultPrinciple Modbus protocolSlave Slave j Slave k Slave address Function code Data RTU modeAscii mode ModesRead Holding/Input Registers 3/4 Modbus functions availableCode Modbus name Description Broadcast Size of data Write Single Register Diagnostics Write Multiple Registers 16 = 16#10 Get Comm Event Counter 11 = 16#0BRead/Write Multiple Registers 23 = 16#17 Machine Read Device Identification 43 = 16#2BMEI Example of positive responseInput variables Logic address Default assignment Output variables Logic address Default assignmentCode Modbus name Description Size of data Parameter Logic Read Input variable address Logic address Default valueParameter Logic Value Parameter assigned Output controlParameter assigned Input monitoringException responses Code Error codeResponse Logic address Parameter Value Read non-existent or protected parametersRS485 standard AppendixMaster Modbus 2-wire standard schematicModbus 4-wire standard schematic Uni-Telway schematic Type of trunk cable Cable with 1 shielded twisted pair Wire Jbus schematicDifferent scenarios Creating a Modbus bus using non-standard equipmentRecommendations Example Calculating the polarizationSUB-D RS485 schematic for the cardCard connector pinout Contact no. SignalAtv71ModbusJbusENV1 2005-05