Schneider Electric VW3 A3 303 user manual Introduction, Presentation, Notation

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3. Introduction

3. 1. Presentation

The communication card (catalog number VW3 A8 303) is used to connect an Altivar 71 drive to a Uni-Telway or Modbus bus.

This manual only describes how to use the Modbus protocol. For Uni-Telway, please refer to the Uni-Telway protocol manual.

The data exchanges permit access to all Altivar 71 functions:

•Configuration

•Adjustment

•Control and command

•Monitoring

•Diagnostics

The card has a female 9-way SUB-D connector for connection to the Modbus bus.

The connection cables and accessories should be ordered separately.

The drive address should be configured using the switches on the card.

The graphic display terminal or the integrated display terminal offer numerous functions for communication diagnostics.

Note: The Modbus card supports the following services in addition to those provided by the drive’s integrated ports:

-2-wire and 4-wire RS485

-Choice of line polarization

-RTU and ASCII modes

-More diagnostic subcodes

-More Modbus functions (04: Read Input Registers and 11: Get Comm Event Counter)

3.2. Notation

Drive terminal displays

The graphic display terminal menus are shown in square brackets.

Example: [1.9 COMMUNICATION]

The integrated 7-segment display terminal menus are shown in round brackets.

Example: (COM-)

Parameter names displayed on the graphic display terminal are shown in square brackets.

Example: [Fallback speed]

Parameter codes displayed on the integrated 7-segment display terminal are shown in round brackets. Example: (LFF)

Formats

Hexadecimal values are written as follows: 16#

Binary values are written as follows: 2#

Abbreviations

Hi: High order

Lo: Low order

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Contents Altivar Contents Electric shock will result in death or serious injury Before you beginDocumentation structure Installation ManualProgramming Manual Communication Parameters ManualNotation IntroductionPresentation Installing the card in the drive Hardware setupReceipt Hardware descriptionCoding the address Switch codingChoosing polarization 1234 AddressModbus RS485 standard Connecting to the busWiring recommendations Connection cables Connection via RJ45 wiring systemConnection accessories Type of master Master interface Description Catalog number Connection cables for the masterTWD XCA RJ030 TSX SCP CMDescription Catalog Number Subscriber socket Connection via junction boxesRS485 double shielded twisted pair CablesTSX P ACC TSX CSA500Communication parameters ConfigurationControl via Modbus in I/O profile Control CommandControl via Modbus or the terminals in I/O profile Parameter Value CommentControl via Modbus or the terminals in Drivecom profile Control via Modbus in Drivecom profileConfiguration Communication scanner Example of configuration via the graphic display terminalRDY NET COM. Scanner InputCOM. Fault Management Communication faultsMonitored parameters CONFIG. COMM. MAPFormat Format Range Terminal displayChecking the address DiagnosticsLEDs Green RUN Red ERR Meaning Corrective actionCommunication MAP RUN NETCOM. Scanner Input MAP COM Scan Output MAP CMD. Word ImageCOM Scan Output MAP Input variable Scanner parameterOutput variable Scanner parameter Card fault Communication faultSlave Slave j Slave k Modbus protocolPrinciple Ascii mode RTU modeModes Slave address Function code DataCode Modbus name Description Broadcast Size of data Modbus functions availableRead Holding/Input Registers 3/4 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 responseCode Modbus name Description Size of data Output variables Logic address Default assignmentInput variables Logic address Default assignment Parameter Logic Input variable address Logic address Default valueParameter Logic Read Parameter assigned Output controlInput monitoring Value Parameter assignedResponse Code Error codeException responses 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 schematicRecommendations Creating a Modbus bus using non-standard equipmentDifferent scenarios Example Calculating the polarizationCard connector pinout RS485 schematic for the cardContact no. Signal SUB-DAtv71ModbusJbusENV1 2005-05