Exception Handling 

Use

You can use exception handling to control the system's reaction to error codes that the PLC reports in telegrams. Furthermore, you can specify the error codes that EWM can set in the confirmation telegram to the PLC in the case of communication errors.

Features

You can define two types of exception in the PLC:

       1.      Exceptions that the PLC reports in the telegram. Assign an exception to each possible PLC error code in Customizing. For more information, see the Implementation Guide (IMG) for EWMunder Material Flow System (MFS) ® EWM Exceptions ® Define EWM Exception for PLC Errors.

       2.      Exceptions that the system sets due to an internally recognized error situation. Here it defines an internal exception. Since this error situation may not be self-explanatory to the user, it must be linked to an external exception in Customizing. This external exception contains a text and possibly a setting for reacting to the error. For more information, see the IMG for EWM under Cross-Process Settings ® Exception Handling ® Assign Internal Exception Codes to Exception Codes.