Message: Only one base function block may be defined in EXTENDS-list.
Possible error cause: Two or more base function blocks are defined in the EXTENDS list.
Error correction: Define only one base function block in the EXTENDS list.
Example of the error:
PROGRAM PLC_PRG VAR fb : FB; END_VAR FUNCTION_BLOCK FB EXTENDS FB2, FB3 VAR END_VAR FUNCTION_BLOCK FB2 VAR END_VAR FUNCTION_BLOCK FB3 VAR END_VAR --> C00096: Only one base function block may be defined in EXTENDS-list