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Schneider Electric VW3 A3 303 user manual Uni-Telway schematic

Models: VW3 A3 303

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9. Appendix

9. 4. Uni-Telway schematic

The Uni-Telway bus schematic was used by Telemecanique for older-generation drives and soft starters (ATV58, ATV28, ATS48, etc.) marketed before the Modbus specifications were published on www.modbus.org.

Schematic diagram:

	Master
	R	G	5 V
	R		5 V
			4.7 kΩ
	4.7 kΩ
		0 V
	D(B)
120 Ω			120 Ω
1 nF			1 nF
	D(A)
	0VL
	5 V		5 V
4.7 kΩ	4.7 kΩ	4.7 kΩ	4.7 kΩ
	4.7 kΩ		4.7 kΩ
	0 V		0 V
R	G	R	G
	G		G

Slave 1

Slave n

Type of trunk cable	Cable with 2 twisted pairs shielded in pairs
Maximum length of bus	1000 m at 19200 bps

Maximum number of stations (without	29 stations, i.e., 28 slaves
repeater)

Maximum length of tap links	• 20 m
	• 40 m divided by the number of tap links on a multiple junction box
Bus polarization	For the master and each slave:

•One 4.7 kΩ pull-up resistor to the 5 V

•One 4.7 kΩ pull-down resistor to the 0 VL

Line termination	One 120 Ω 0.25 W resistor in series with a 1 nF 10 V capacitor

Common polarity	Yes (0 VL) and high impedance placed between 0 VL and the ground in each station

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Schneider Electric VW3 A3 303 user manual Uni-Telway schematic

Contents

Altivar Contents Before you begin Electric shock will result in death or serious injuryProgramming Manual Installation ManualDocumentation structure Communication Parameters ManualIntroduction PresentationNotation Receipt Hardware setupInstalling the card in the drive Hardware descriptionSwitch coding Choosing polarizationCoding the address Address 1234Connecting to the bus Wiring recommendationsModbus RS485 standard Connection via RJ45 wiring system Connection accessoriesConnection cables TWD XCA RJ030 Connection cables for the masterType of master Master interface Description Catalog number TSX SCP CMRS485 double shielded twisted pair Connection via junction boxesDescription Catalog Number Subscriber socket CablesTSX CSA500 TSX P ACCConfiguration Communication parametersControl via Modbus or the terminals in I/O profile Control CommandControl via Modbus in I/O profile Parameter Value CommentControl via Modbus in Drivecom profile Control via Modbus or the terminals in Drivecom profileConfiguration RDY NET Example of configuration via the graphic display terminalCommunication scanner COM. Scanner InputCommunication faults COM. Fault ManagementFormat CONFIG. COMM. MAPMonitored parameters Format Range Terminal displayLEDs DiagnosticsChecking the address Green RUN Red ERR Meaning Corrective actionCOM. Scanner Input MAP RUN NETCommunication MAP COM Scan Output MAP CMD. Word ImageInput variable Scanner parameter Output variable Scanner parameterCOM Scan Output MAP Communication fault Card faultModbus protocol PrincipleSlave Slave j Slave k Modes RTU modeAscii mode Slave address Function code DataModbus functions available Read Holding/Input Registers 3/4Code Modbus name Description Broadcast Size of data Write Single Register Diagnostics Get Comm Event Counter 11 = 16#0B Write Multiple Registers 16 = 16#10Read/Write Multiple Registers 23 = 16#17 Read Device Identification 43 = 16#2B MachineExample of positive response MEIOutput variables Logic address Default assignment Input variables Logic address Default assignmentCode Modbus name Description Size of data Input variable address Logic address Default value Parameter Logic ReadParameter Logic Input monitoring Output controlParameter assigned Value Parameter assignedCode Error code Exception responsesResponse Read non-existent or protected parameters Logic address Parameter ValueAppendix RS485 standardModbus 2-wire standard schematic MasterModbus 4-wire standard schematic Uni-Telway schematic Wire Jbus schematic Type of trunk cable Cable with 1 shielded twisted pairCreating a Modbus bus using non-standard equipment Different scenariosRecommendations Calculating the polarization ExampleContact no. Signal RS485 schematic for the cardCard connector pinout SUB-DAtv71ModbusJbusENV1 2005-05