What to do after an "Operand Error 320: Invalid FB parameter"?

FAQ #100433

 

Symptom
During a project build while the linking process an error message as listed below appears:
Operand errors:
Error 320: Fupla.fbd: Line 4: Invalid FB parameter: CFB _HEAVAC._FB._REG1: Param 2. See module heavac5.srx: Line 919
Error 320: Fupla.fbd: Line 5: Invalid FB parameter: CFB _HEAVAC._FB._REG1: Param 3. See module heavac5.srx: Line 927
Error 320: Fupla.fbd: Line 4: Invalid FB parameter: CFB _HEAVAC._FB._REG1: Param 2. See module heavac5.srx: Line 919
Error 320: Fupla.fbd: Line 5: Invalid FB parameter: CFB _HEAVAC._FB._REG1: Param 3. See module heavac5.srx: Line 927
This problem still remains after a "Rebuild All". 

 

Reason
This error message is generated because an internal, project related symbol table is corrupted. As long as PG5 recognizes that this file is present, it won't be re-generated (and therefore will cause the same error again and again).

Solution
In order to resolve this problem, a "Clean Files" of the "Symbol information files" can be executed. The "Clean Files"-window is opened from the menu "CPU", "Clean Files...".

Additional note
The "Clean Files" for the symbol information files will re-allocate all dynamically distributed symbols!