Variable Value Invalid

What does 1422 mean?

This message, specifically '{$variable} value invalid', indicates that a variable in the KUKA KRC4 KSS 8.3 robot program has been accessed or assigned a value that is invalid. This can occur if the variable is uninitialized, assigned an incompatible data type, or its value falls outside expected operational limits, potentially leading to incorrect program execution or runtime errors.

• Accessing a variable (e.g., $POS_INT) before it has been properly initialized or assigned a value.
• Attempting to assign a value of an incorrect data type to a declared variable, leading to a type mismatch.
• A variable's value is out of the permissible range or domain expected by the system or the program logic.
• A logical error in the program's flow of control causes a variable to reach an unintended or invalid state.

Click steps to track your progress.

1. 1

   Review the robot program code at the line indicated by the error (e.g., Line 5) to identify the specific variable involved and the operation being performed.

2. 2

   Verify that all variables are explicitly initialized with appropriate values before they are first used in any calculations, assignments, or comparisons.

3. 3

   Check the data type declaration of the variable and ensure that any values assigned to it are compatible with its declared type.

4. 4

   Utilize the KUKA HMI's variable monitor or watch window to observe the real-time values of the relevant variables during program execution to pinpoint when the invalid value occurs.

5. 5

   Implement robust error handling using statements like ON_ERROR_PROCEED and SWITCH ($ERR.NUMBER) to catch and manage invalid variable conditions programmatically.