Creating a Device Project with Modbus
You create two device projects in a shared workspace. One project acts as a Modbus TCP Server and the other project acts as a Modbus TCP Client. Both projects continuously exchange their values according to the ping-pong principle. In addition, you monitor the device state and the exchanged values.
Limitations of Modbus in CODESYS 4
Only Modbus TCP is currently available. The serial gateway of the client side cannot yet be implemented in CODESYS 4.
The additional TCP Server mappings for status and request count of each individual channel are currently not supported.
The editor does not provide a status page or advanced diagnosis options.
The editors do not automatically switch to read-only while logged in or in online mode.