What causes KUKA Robot alarm KRC0987?

Attempting to reassign a signal variable to a different data type after initial declaration. Type casting or conversion operation applied to a signal object with incompatible target type. Modifying signal type through indirect assignment or parameter passing with mismatched types. Using signal objects in expressions where type coercion is attempted by the compiler. Conflicting signal type definitions in overlapping program scopes or include files.

How do I fix KUKA Robot alarm KRC0987?

1. Review the KRL source code around the error location to identify the line attempting signal type modification 2. Verify that the signal object type matches its original declaration throughout the program 3. Ensure function parameters and return types are correctly defined to match expected signal types 4. Check for type casting operations and remove or replace with compatible type-safe alternatives 5. Validate all include files and module dependencies for conflicting signal type declarations 6. Recompile the KRL program after corrections and verify signal object usage against KUKA type system rules

KUKA Robot codes

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KUKA Robot Controller

System · Basic

Alarm KRC0987

KUKA Robot KRC0987 - SIGNAL TYPE CANNOT BE CHANGED 2324

This alarm indicates that an attempt was made to change the signal type of a KRL program object that does not permit type modification. Signal types in KUKA KRL are established at declaration and cannot be reassigned to a different type category during program execution or compilation.

KUKA RobotSystemBasic

KRC0987

KUKA Robot KRC0987 - SIGNAL TYPE CANNOT BE CHANGED 2324

SIGNAL TYPE CANNOT BE CHANGED 2324

Common Causes

Attempting to reassign a signal variable to a different data type after initial declaration
Type casting or conversion operation applied to a signal object with incompatible target type
Modifying signal type through indirect assignment or parameter passing with mismatched types
Using signal objects in expressions where type coercion is attempted by the compiler
Conflicting signal type definitions in overlapping program scopes or include files

Troubleshooting Steps

1Review the KRL source code around the error location to identify the line attempting signal type modification
2Verify that the signal object type matches its original declaration throughout the program
3Ensure function parameters and return types are correctly defined to match expected signal types
4Check for type casting operations and remove or replace with compatible type-safe alternatives
5Validate all include files and module dependencies for conflicting signal type declarations
6Recompile the KRL program after corrections and verify signal object usage against KUKA type system rules

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