Introduction to System Messages Introduction to System Messages While the eV+ system is being used, it is possible for hardware and software errors to occur. For example, if commands or instructions are not entered in the correct way, eV+ rejects the input. The usual response is to write an error message to the system terminal indicating what is wrong so that you can correct the error. In addition to error messages, eV+ can also issue warning or informational messages. In eV+, each error message is normally assigned an error number (or code) and an associated error string. The following numbering conventions are used to identify the type of system message generated:
l Informational Messages (numbers 0 to 49) list messages that provide information. l Warning Messages (numbers 50 to 299) list warning messages that you may receive. l Error Messages (negative numbers) list the error messages that you may receive. Most message codes associated with errors can be made available to a program by the ERROR function, which returns the code of the latest error that occurred. In addition, the $ERROR function returns the error message associated with any eV+ error code. Documentation The eV+ system message documentation allows you to look up the details of an error message either alphabetically by the message string, or numerically by the system code.
For details, see Related Topics. For each message, the documentation includes the message code, the text of the message, and sometimes a comment about the applicability of the message. Angle brackets ( ) are used to enclose a description of an item that appears in that position. All numbers are decimal. Updates Changes to eV+ system messages are summarized in the eV+ Release Notes. Related Topics Alphabetical List of eV+ System Messages Numerical List of eV+ System Messages ERROR real-valued function $ERROR string function System Messages - Alphabetical List eV+Language Reference Guide, v2.x, 18319-000 Rev A Page 585