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. - Test if an integer is odd
Inputs
IN : DINT Input value
Outputs
Q : BOOL TRUE if IN is odd. FALSE if IN is even.
Remarks
In FFLD language, the input rung (EN) enables the operation, and the output rung is the
result of the function. In IL"Instruction list"
This is a low-level language and resembles assembly language, the input must be loaded before the function call.
ST Language
Q := ODD (IN);
FBD Language
FFLD Language
(* The function is executed only if EN is TRUE *)
IL Language:
Op1: LD"Ladder diagram"
Ladder logic is a method of drawing electrical logic schematics. It is now a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical "rails" and a series of horizontal "rungs" between them IN
ODD
ST Q (* Q is TRUE if IN is odd *)
See also
