WAGO 750 Series Manual page 180

176 • Application Examples
Example of a Modbus TCP Server
The Modbus addresses are:
Register Read Access:
Start address
0x0000
0x0200
Register Write Access:
Start address
0x0000
0x0200
The dynamic loadable module "kbus.o" is used for the internal bus support.
In addtition, kbusapi is used which makes it easier to access the internal bus
module. This API (Application Interface) is added to the program during
compilation and linking. The API interfaces are also described in this chapter.
The dynamic loadable module kbus.o serves to access the connected modules
from a user program environment. In order to illustrate the driver interface, the
Linux coupler incorporates the kbusdemo example program. This program can
read or write the state/data of the internal bus via the Linux console.
Source code description
A more detailed description of the source code is not given now. The Modbus
TCP server is only supposed to illustrate a more complex application on the
Linux fieldbus coupler. Furthermore, the program is used to conduct a
functional test of the Linux coupler and is hence installed on every coupler.
The customer can change or extend the source code arbitrarily.
End address
0x01FF
0x03FF
End address
0x01FF
0x03FF
Description
Inputs of the process image
Outputs of the process image
Description
Outputs of the process image
Outputs of the process image
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler