CMP

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 Function BlockClosed A function block groups an algorithm and a set of private data. It has inputs and outputs. - Comparison with detailed outputs for integer inputs.

Inputs

Input

Data Type

Range

Unit

Default

Description

IN1

DINT

 

 

 

First value.

IN2

DINT

 

 

 

Second value.

Outputs

Output

Data Type

Range

Unit

Description

EQ

BOOL

 

 

TRUE if IN1 = IN2.

GT

BOOL

 

 

TRUE if IN1 > IN2.

LT

BOOL

 

 

TRUE if IN1 < IN2.

Remarks

None

FBD Language Example

FFLD Language Example

  • The rung input (EN) validates the operation.
    • The rung output is the result of LT (lower than) comparison).
    • The comparison is executed only if EN is TRUE.

IL Language Example

(* MyCmp is declared as an instance of CMP 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. block *)
Op1: CAL MyCmp (IN1, IN2)
     LDClosed Ladder diagram - This is a method of drawing electrical logic schematics. It is 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.  MyCmp.LT
     ST  bLT
     LD  MyCmp.EQ
     ST  bEQ
     LD  MyCmp.GT
     ST  bGT

ST Language Example

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

See Also