Error diagnosis
In the following sections, possible errors for all components of the OPC UA setup are shown in the form of a table. In addition, helpful troubleshooting hints are provided for the respective errors.
Behavior | Remedy |
|---|---|
The attempt to read or write a StructuredDataType from a server using the PLCopen function blocks fails. | Structured Data Types are not supported by the PLCopen-based client. Please use the I/O client for this purpose. |
When the PLCopen function blocks are executed, the Busy output remains TRUE, but no error is output and the timeout is not triggered. | This is an indication of insufficient ADS router memory. Please increase your router memory in the corresponding settings of the TwinCAT ADS router. |
When creating a new I/O client by specifying the Server URL with the host name of the server, no connection can be established subsequently via the AddNodes dialog. | Please check if name resolution is operational in your network. Alternatively try again via the IP address of the server. |
Some configuration items from the I/O client are not present, although they should be according to the documentation. | In this case, the System Manager description file (TMC) was probably not updated after a TF6100 update. Please execute the command "Reload TMC" from the context menu of the I/O client to reload the description file. |
Write commands to a variable are not executed by the I/O client or do not reach the server. | Please check whether the "Write Enable" output has been enabled on the I/O client. |