Beckhoff BK7300 User Manual download pdf (Page 4)

Table of Contents

BK7300

3. MODBUS 15

Basic Principles 15

Bus Topology 15

Process Data and Memory Map 16

Settings and Parameterization 17

Parameterization Table 18

Protocol 19

ASCII 19

RTU 19

Functions 19

Read Digital Outputs (Function 1) 20

Read Digital Inputs (Function 2) 21

Read Analogue Outputs (Function 3) 22

Read Analogue Inputs (Function 4) 23

Writing a Digital Output (Function 5) 24

Writing an Analogue Output (Function 6) 25

Writing a Number of Digital Outputs (Function 15) 26

Writing a Number of Analogue Outputs (Function 16) 27

Writing and Reading a Number of Analogue Outputs or Inputs (Function 23) 28

Diagnostics 29

Echoes a query (Sub-Function 0) 29

Coupler Reset (Sub-Function 1) 30

Delete All Counter Contents (Sub-Function 10) 30

Bus Communication Error Counter (Sub-Function 11) 30

Error Answer Counter (Sub-Function 13) 30

Slave Answers (Sub-function 14) 30

Unsent Slave Answers (Sub-Function 15) 30

Number of Error Answers (Sub-Function 16) 30

BK7300 Error Answers 31

4. Appendix 32

MODBUS Interface 32

Terminal Mapping 34

List of References 34

5. Index 35

6. Support and Service 36

Beckhoff's branch offices and representatives 36

Beckhoff Headquarters 36

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Beckhoff BK7300 User Manual Page 4