FUNCTION_BLOCK FB20
CONST
LIMIT=7
END_CONST

VAR_IN_OUT
sortbuffer : ARRAY[0..LIMIT] OF INT; // I/O Parameters
END_VAR

VAR_OUTPUT
calcbuffer : ARRAY[0..LIMIT] OF
STRUCT
squareroot : INT;
square : INT;
END_STRUCT;
END_VAR

VAR_TEMP
swap : BOOL;
index, aux : INT;
valr, resultr : REAL ;
END_VAR
;
END_FUNCTION_BLOCK
出现标识符已存在，和无效常数的错误