KUKA Robot codes
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KUKA Robot Controller

System · Basic

Alarm KRC0907

KUKA Robot KRC0907 - OPERAND TYPES NOT COMPARABLE 2244

This alarm occurs when a comparison operation is attempted between two operands of incompatible or non-comparable data types in a KRL program. The KRL compiler cannot evaluate the comparison because the operands lack a defined comparison relationship, preventing logical operations like IF statements or WHILE loops from executing.

KUKA RobotSystemBasic

KRC0907

KUKA Robot KRC0907 - OPERAND TYPES NOT COMPARABLE 2244

OPERAND TYPES NOT COMPARABLE 2244

This alarm occurs when a comparison operation is attempted between two operands of incompatible or non-comparable data types in a KRL program. The KRL compiler cannot evaluate the comparison because the operands lack a defined comparison relationship, preventing logical operations like IF statements or WHILE loops from executing.

Common Causes

  • Attempting to compare different data types (e.g., INT vs REAL, BOOL vs STRING)
  • Comparing custom structured types or AXIS data with incompatible types
  • Using comparison operators on undefined or uninitialized variables
  • Mixing enumeration types or robot-specific types in conditional statements
  • Incorrect operand type casting or missing type conversion in logical expressions

Troubleshooting Steps

  1. 1Review the comparison statement at the error location and identify both operands involved
  2. 2Verify that both operands have compatible data types that support comparison operations
  3. 3Ensure variables are properly declared and initialized before use in comparisons
  4. 4Apply explicit type casting or conversion functions if intentional type mixing is required
  5. 5Consult the KRL data type compatibility matrix to confirm valid comparison combinations
  6. 6Recompile the KRL program after corrections and verify syntax in the KUKA IDE

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