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FunctionClosed 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. - Get the minimum of two integers.

Inputs

IN1 : DINT First input
IN2 : DINT Second input

Outputs

Q : DINT   IN1 if IN1 < IN2; IN2 otherwise

Remarks

In FFLD language, the input rung (EN) enables the operation, and the output rung keeps the state of the input rung. In ILClosed "Instruction list" This is a low-level language and resembles assembly language, the first input must be loaded before the function call. The second input is the operand of the function.

ST Language

Q := MIN (IN1, IN2);

FBD Language

MinFbd.gif (1260 octets)

FFLD Language

(* The comparison is executed only if EN is TRUE *)
(* ENO has the same value as EN *)
MinLd.gif (1526 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  IN1
     MIN IN2
     ST  Q    (* Q is the minimum of IN1 and IN2 *)

See also

MAX   LIMIT   MOD   ODD