A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Concatenate strings.
Inputs
IN_1 : STRING Any string variable or constant expression
...
IN_N : STRING Any string variable or constant expression
Outputs
Q : STRING Concatenation of all inputs
Remarks
In FBD"Function block diagram"
A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks or FFLD language, the block can have up to 16 inputs. In IL"Instruction list"
This is a low-level language and resembles assembly or ST"Structured text"
A high-level language that is block structured and syntactically resembles Pascal, the
function accepts a variable number of inputs (at least 2).
Note that you also can use the "+" operator to concatenate strings.
ST Language
Q := CONCAT ('AB', 'CD', 'E');
(* now Q is 'ABCDE' *)
FBD Language
FFLD Language
IL Language
Op1: FFLD 'AB'
CONCAT 'CD', 'E'
ST Q (* Q is now 'ABCDE' *)
