Schneider Electric VW3 A3 303 user manual Get Comm Event Counter 11 = 16#0B

Page 30

8. Modbus protocol

8. 7. Get Comm Event Counter (11 = 16#0B)

Question:

Slave no.	0B	CRC16
1 byte	1 byte	2 bytes
Response:

Slave no.

1 byte

0B

1 byte

0000

2 bytes

Value of counter

Hi Lo

2 bytes

	CRC16
Lo		Hi

	2 bytes

8. 8. Write Multiple Registers (16 = 16#10)

Request:

Slave no.

10

No. of first word

Number of words

Number of bytes

Value of first word

Hi

Lo

Hi

Lo

Hi

Lo

1 byte

1 byte

2 bytes

2 bytes

1 byte

2 bytes

Response:

Slave no.

10

No. of first word

Number of words

CRC16

Hi

Lo

Hi

Lo

Lo

Hi

1 byte

1 byte

2 bytes

2 bytes

2 bytes

-------

CRC16

Lo	Hi

2 bytes

Example: Write values 20 and 30 to logic address words 9001 and 9002 on slave 2 (acceleration time = 20 s and deceleration time = 30 s)

Request:

Slave no.

Request

No. of first word

Number of

Number of

Value of first word

Value of second

CRC16

code

words

bytes

word

Hi

Lo

Hi

Lo

Hi

Lo

Hi

Lo

Lo

Hi

02

10

23

29

00

02

04

00

14

00

1E

73

A4

Response:

Slave no.

Response code

No. of first word

Number of words

CRC16

Hi

Lo

Hi

Lo

Lo

Hi

02

10

23

29

00

02

9B

B7

30

Image 30

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