CMP

Function Block - Comparison with detailed outputs for integer inputs

Inputs

IN1 : DINT First value
IN2 : DINT Second value

Outputs

LT : BOOL TRUE if IN1 < IN2
EQ : BOOL TRUE if IN1 = IN2
GT : BOOL TRUE if IN1 > IN2

Remarks

In LD language, the rung input (EN) validates the operation. The rung output is the result of "LT" (lower than) comparison).

ST Language

(* MyCmp is declared as an instance of CMP function block *)
MyCMP (IN1, IN2);
bLT := MyCmp.LT;
bEQ := MyCmp.EQ;
bGT := MyCmp.GT;

FBD Language

CmpFbd.gif (1358 octets)

LD Language

(* the comparison is performed only if EN is TRUE *)
CmpLd.gif (1476 octets)

IL Language:

(* MyCmp is declared as an instance of CMP function block *)
Op1: CAL MyCmp (IN1, IN2)
     LD MyCmp.LT
     ST bLT
     LD MyCmp.EQ
     ST bEQ
     LD MyCmp.GT
     ST bGT

CMP