Hi,
1: Network diagnostics
To check the network settings or the network connection to another network participant, it is possible to send a ping from the B&R controller. The AsICMP library is available for this purpose and includes an example:
If the other party cannot be reached via a ping, the Ethernet settings and the network must be checked.
2: Modbus TCP Client diagnostics
If you configure a Modbus TCP master, a Modbus client is activated in the operating system. This makes logger entries. It is therefore interesting to see whether there are entries for Modbus TCP in the controller logger.
3: Settings
To check the settings, the B&R support department typically always requests the entire Automation Studio project. This way, all settings can be viewed in full.
4: Configuration of the Modbus registers
To configure the registers correctly, a good data sheet for the remote station is helpful. Is there one?
5: Test with another client.
There are Modbus TCP freeware Windows clients. These can be used instead of the controller for a simple test. These can be used to rule out network problems and verify the register addresses. These tools are usually faster for testing.
6: Network trace
I only recommend a network recording if points 1 to 4 are not sufficient. Tools such as Wireshark can be used for this.
Best regards Stefan