BECKHOFF BK7300 - Manual (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