Beckhoff BC7300 Manuel d'utilisateur télécharger pdf (Page 45)

BC7300 45

Query

Byte Name

Example RTU Description

Slave address

11 0x0B

Function code

4 0x04

Start address high

0 0x00

Start address low

0 0x00

Count high

0 0x00

Count low

2 0x02 Number of data words

Error Check

LRC / CRC

0x71

0x61

End of frame

t1-t2-t3

Response

The Bus Terminal Controller answers with byte count 4, i.e. 4 bytes of data

are returned. The query was for 2 input words, and these are now

distributed over 4 bytes.

Byte Name

Example RTU Description

Start frame

Slave address

11 0x0B

Function code

4 0x04

Count byte

4 0x04 Number of data bytes

Data 1 high byte

0 0x00 Address %QB129

Data 1 low byte

56 0x38 Address %QB128

Data 2 high byte

63 0x3F Address %QB131

Data 2 low byte

11 0x0B Address %QB130

Error Check

LRC / CRC

0x80

0x7E

End of frame

t1-t2-t3

1 2 ... 40 41 42 43 44 45 46 47 48

Bus Terminal Controller 1
Please note the following 2
Table of contents 3
5. Appendix 41 4
6. Questions and Answers 46 4
7. Index 47 4
8. Support and Service 48 4
Foreword 5
Safety Instructions 6
Electrical power supply 9
Power contacts 9
Fieldbus connection 9
KS2000 Software 10
TwinCAT BC 10
K-Bus Contacts 10
Electrical isolation 10
Controller 11
Mechanical structure 11
Technical data 14
Fieldbus errors 18
Basic Principles 19
Bus Topology 19
Process Data and Memory Map 20
BECKHOFF 21
MODBUS Process Image 22
BC7300 Process Image 22
Parameterisation Table 25
The MODBUS Protocol 26
Functions 27
(Function 23) 33
Diagnostics 34
BC7300 Error Answers 37
Persistent Data 39
Allocated flags area 40
Appendix 41
Mapping the Bus Terminals 42
List of references 42
Firmware 42
Example Program 43
Creating the BOOT Program 44
MODBUS Communication 44
Questions and Answers 46
Support and Service 48

Commentaires sur ces manuels

Pas de commentaire

Beckhoff BC7300 Manuel d'utilisateur Page 45

Commentaires sur ces manuels

Produits connexes et manuels pour Équipement Beckhoff BC7300