KRC0517

Common Causes

• Attempting to modify a system variable marked as CONST in the data list or global system declarations within the KRL program
• Writing to a predefined KUKA system variable such as $AXIS_ACT or other reserved variables that only the controller can update
• Assigning values to enumeration type variables using incorrect syntax or out-of-range values not defined in the ENUM declaration
• Attempting to change read-only robot configuration parameters like $RET or $LOAD during program runtime instead of through proper system configuration
• Type mismatch error where the assigned value data type does not match the declared variable type, triggering a protection mechanism

Troubleshooting Steps

1. 1Step 1: Note the exact line number displayed with the alarm on the smartPAD and open the KRL program in the editor to locate the offending assignment statement
2. 2Step 2: Check the variable declaration in the DAT file to verify whether the variable is declared with the CONST keyword or as a read-only type
3. 3Step 3: Review KUKA system variable documentation to confirm whether the variable being written to is a reserved system variable that cannot be modified by user programs
4. 4Step 4: If assigning to an ENUM or structured type, verify the assigned value matches exactly one of the defined enumeration values or structure format
5. 5Step 5: Modify the KRL code to either use a different writable variable or remove the assignment if attempting to change a protected system parameter
6. 6Step 6: Recompile the program, clear the error, and test execution in T1 mode; if issue persists with valid code, check WorkVisual project for corrupted declarations and re-download