Write Single Register | Schneider Electric VW3 A3 303 specs

8. Modbus protocol

8. 5. Write Single Register (6)

Request and response:

Slave no.

Word number

Value of word

CRC16

1 byte

2 bytes

Example: Write value 16#000D to logic address word 9001 (16#2329) on slave 2 (ACC = 13 s)

Request and response:

2329

000D

9270

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Schneider Electric VW3 A3 303 user manual Write Single Register

Contents

Altivar Contents Before you begin Electric shock will result in death or serious injury Installation Manual Documentation structureProgramming Manual Communication Parameters Manual Presentation IntroductionNotation Hardware setup Installing the card in the driveReceipt Hardware description Choosing polarization Switch codingCoding the address Address 1234 Wiring recommendations Connecting to the busModbus RS485 standard Connection accessories Connection via RJ45 wiring systemConnection cables Connection cables for the master Type of master Master interface Description Catalog numberTWD XCA RJ030 TSX SCP CM Connection via junction boxes Description Catalog Number Subscriber socketRS485 double shielded twisted pair Cables TSX CSA500 TSX P ACC Configuration Communication parameters Control Command Control via Modbus in I/O profileControl via Modbus or the terminals in I/O profile Parameter Value Comment Control via Modbus in Drivecom profile Control via Modbus or the terminals in Drivecom profile Configuration Example of configuration via the graphic display terminal Communication scannerRDY NET COM. Scanner Input Communication faults COM. Fault Management CONFIG. COMM. MAP Monitored parametersFormat Format Range Terminal display Diagnostics Checking the addressLEDs Green RUN Red ERR Meaning Corrective action RUN NET Communication MAPCOM. Scanner Input MAP COM Scan Output MAP CMD. Word Image Output variable Scanner parameter Input variable Scanner parameterCOM Scan Output MAP Communication fault Card fault Principle Modbus protocolSlave Slave j Slave k RTU mode Ascii modeModes Slave address Function code Data Read Holding/Input Registers 3/4 Modbus functions availableCode Modbus name Description Broadcast Size of data Write Single Register Diagnostics Get Comm Event Counter 11 = 16#0B Write Multiple Registers 16 = 16#10 Read/Write Multiple Registers 23 = 16#17 Read Device Identification 43 = 16#2B Machine Example of positive response MEI 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 Output control Parameter assignedInput monitoring Value Parameter assigned Exception responses Code Error codeResponse Read non-existent or protected parameters Logic address Parameter Value Appendix RS485 standard Modbus 2-wire standard schematic Master Modbus 4-wire standard schematic Uni-Telway schematic Wire Jbus schematic Type of trunk cable Cable with 1 shielded twisted pair Different scenarios Creating a Modbus bus using non-standard equipmentRecommendations Calculating the polarization Example RS485 schematic for the card Card connector pinoutContact no. Signal SUB-D Atv71ModbusJbusENV1 2005-05