Switch coding, Coding the address | Schneider Electric VW3 A3 303

4. Hardware setup

4. 4. Switch coding

bChoosing polarization

Normal setting for a Modbus bus:

• No polarization at drive level

Special setting (see "Creating a Modbus bus using non-standard equipment" on page 44):

• 4.7 kΩ RS485 line polarization at drive level

bCoding the address

The address switches are used to encode the address (1 to 247) of the drive on the bus.

The switch settings can only be changed when the drive is turned off.

The correspondence between the value and the position of the switch is as follows:

•0 = OFF = Switch in upper position

•1 = ON = Switch in lower position

The address is binary-coded.

Examples:

Address 11 = 2#0000 1011

Address 34 = 2#0010 0010

Page 7

Image 7

Schneider Electric VW3 A3 303 user manual Switch coding, Choosing polarization, Coding the address

Contents

Altivar Contents Electric shock will result in death or serious injury Before you begin Communication Parameters Manual Installation ManualDocumentation structure Programming Manual Presentation IntroductionNotation Hardware description Hardware setupInstalling the card in the drive Receipt Choosing polarization Switch codingCoding the address 1234 Address Wiring 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 RJ030 Cables Connection via junction boxesDescription Catalog Number Subscriber socket RS485 double shielded twisted pair TSX P ACC TSX CSA500 Communication parameters Configuration Parameter Value Comment Control CommandControl via Modbus in I/O profile Control via Modbus or the terminals in I/O profile Control via Modbus or the terminals in Drivecom profile Control via Modbus in Drivecom profile Configuration COM. Scanner Input Example of configuration via the graphic display terminalCommunication scanner RDY NET COM. Fault Management Communication faults Format Range Terminal display CONFIG. COMM. MAPMonitored parameters Format Green RUN Red ERR Meaning Corrective action DiagnosticsChecking the address LEDs COM Scan Output MAP CMD. Word Image RUN NETCommunication MAP COM. Scanner Input MAP Output variable Scanner parameter Input variable Scanner parameterCOM Scan Output MAP Card fault Communication fault Principle Modbus protocolSlave Slave j Slave k Slave address Function code Data RTU modeAscii mode Modes Read 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#0B Read/Write Multiple Registers 23 = 16#17 Machine Read Device Identification 43 = 16#2B MEI Example of positive response Input 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 monitoring Exception responses Code Error codeResponse Logic address Parameter Value Read non-existent or protected parameters RS485 standard Appendix Master Modbus 2-wire standard schematic Modbus 4-wire standard schematic Uni-Telway schematic Type of trunk cable Cable with 1 shielded twisted pair Wire Jbus schematic Different scenarios Creating a Modbus bus using non-standard equipmentRecommendations Example Calculating the polarization SUB-D RS485 schematic for the cardCard connector pinout Contact no. Signal Atv71ModbusJbusENV1 2005-05