Logging is an effective tool for troubleshooting and debugging station communications problems. Each driver and device installed on the connected station has a log category based on its type.

In Niagara 4 logging is handled by the Java.util.logging (JUL) utility which supports multiple concurrent log handlers and provides hierarchical logging support. Also in systems without the Workbench connection, this capability allows you to enable/disable loggers using a web browser.

Logging configuration settings for local or Workbench logs are stored in the !logging/logging.properties file which exists in two locations, your Workbench User Home and the daemon User Home, and are maintained by the framework.

The Logger Configuration tool has seven severity levels which differs from the number of log levels used in NiagaraAX. Log levels used are mapped as shown here:

The Logger Configuration view is the main view for the Logger Configuration tool, as well as for the station DebugService.

Figure 121.   Logger Configuration view

Logs for the connected station are visible in the platform Application Director view. While logs for Workbench are visible in the Niagara console started with Workbench.

The logs are persisted each time they are changed, since the changes are saved to the logging.properties file.

The ROOT log category is essentially a default log level. If any log is set to severity log level default, it uses the same configured severity level selected for the Root of that particular log. For example, the following diagram setting alarm to the default log level means that the alarm log level has been set to warning (the configured level of default row).

Figure 122.   logSetup

Both Local ( Workbench ) Spy and Remote ( Station ) Spy can be accessed via Workbench by right-clicking the station in the Nav tree. Only Remote ( Station ) Spy can be accessed via a web browser using the url :http(s)://<ip address>:<port number>/ord?spy: