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FunctionClosedA 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 ILClosed"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

OddFbd.gif (1154 octets)

FFLD Language

(* The function is executed only if EN is TRUE *)
OddLd.gif (1355 octets)

IL Language:

Op1: LDClosed"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

MIN   MAX   LIMIT   MOD