Table of contents
BC7300
3
Table of contents
1. Foreword
5
Notes on the documentation
5
Liability Conditions
5
Delivery conditions
5
Copyright
5
Safety Instructions
6
State at Delivery
6
Description of safety symbols
6
2. Basic Principles
7
Device Description of the BC7300
7
The Beckhoff Bus Terminal System
7
The interfaces
9
Electrical power supply
9
Power contacts feeding points
9
Power contacts
9
Fieldbus connection
9
Configuration and programming interface
10
KS2000 Software
10
TwinCAT BC
10
K-Bus Contacts
10
Electrical isolation
10
Operating Modes of the Bus Terminal Controller
11
Mechanical structure
11
Technical data
14
Peripheral Data in the Process Image
15
Start-up procedure and Diagnostics
16
Fieldbus errors
18
3. MODBUS
19
Basic Principles
19
Bus Topology
19
Process Data and Memory Map
20
MODBUS Process Image
22
BC7300 Process Image
22
Assignment of the Bus Terminals
23
Setting and Parameterisation of the MODBUS
24
Parameterisation Table
25
The MODBUS Protocol
26
ASCII
26
RTU
26
Functions
27
Read Digital Outputs (Function 1)
27
Read Digital Inputs (Function 2)
28
Read Analog In/Outputs (Function 3)
28
Read Analog Inputs (Function 4)
29
Writing a Digital Output (Function 5)
30
Writing an Analog Output (Function 6)
30
Writing a Number of Digital Outputs (Function 15)
31
Writing a Number of Analog Outputs (Function 16)
32
Writing and Reading Analog Outputs and Inputs
33
(Function 23)
33
Echoes a query (Sub-Function 0)
35
Bus Coupler Reset (Sub-Function 1)
35
Delete All Counter Contents (Sub-Function 10)
35
Bus Communication Error Counter (Sub-Function 11)
35
Error Answer Counter (Sub-Function 13)
35
Slave Answers (Sub-Function 14)
36
