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6. The SPEL+ Language

6.12 Error handling

When an error occurs in a SPEL

function, you can cause execution to be transferred to an

error handling routine for processing the error. The routine must be inside a function

definition.

The table on the next page shows the program instructions that are used for error handling.

Item Purpose

OnErr Use the OnErr statement to define the location of the error handling routine.

Err Use Err to retrieve the number for the current error status. Use this in the

error handling routine to determine which error has occurred.

Error Generate a user defined error which can be caught by an error handler.

Era Use Era to retrieve the axis number for which the error occurred. This is

normally used in the error handling routine.

Erl Use Erl to retrieve the line number in which the error occurred. This is

normally used in the error handling routine.

Ert Use Ert to retrieve the task number in which the error occurred. This is

normally used in the error handling routine.

ErrMsg$ Use ErrMsg$ to retrieve the error message associated with a specified error

number.

User Errors

You can define your own error messages by using the User Error Editor which is available

from the Tools Menu. See the section on User Error Editor in the chapter EPSON RC+ 5.0

GUI for details.

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