How do you clear problems with the Modbus TCPI/IP communication with WinCC V7.X?
You have connected a Modbus device to WinCC V7.X and WinCC V7.X reports an addressing error with the Modbus address.
The Modbus TCP/IP channel was tested together with Schneider controllers. This is why the types of the Schneider controllers are specified in the settings of the Modbus TCPI/IP channel. Communication to other Modbus devices is possible as long as they comply with Modbus specifications.
Remedy for incorrect addressing
Proceed as follows to clear addressing problems:
- In the WinCC Explorer you open the Tag Management editor.
- Open the Tag Management tree structure and under Modbus TCPIP you select your channel unit and your connection.
- Right-click your connection to open the connection parameters.
- Change the CPU type to one of the other two types and test your connection.
Further information is available in the WinCC manual: 109760748