Lenze DDS v2.0 Manuel d'utilisateur télécharger pdf (Page 15)

Introduction to IEC 61131-3 programming

Programming languages

l DDS-IEC61131 EN 2.0

5.2 Structured Text (ST)

(Structured Text)

Structured Text consists of instructions which can be executed like in high languages with

conditions (IF..THEN..ELSE) or in loops (WHILE..DO).

Structured Text is an easily readable and understandable programming language that does not only

offer powerful loop programming and the possibility of conditioned commands but also imaging

mathematical functions.

Example:

IF value < 7 THEN

WHILE value < 8 DO

value := value + 1;

END_WHILE;

END_IF;

Instructions (overview)

Ty pe of ins t ruction Example

Assignment by assignment operator A:=B;

CV:=CV+1;

C:=SIN(X);

Call of a function block,

use of an FB

CMD_TMR(IN:=%IX5, PT:=300);

A:=CMD_TMR.Q

RETURN RETURN;

IF condition D:=B*B;

IF D<0.0 THEN

C:=A;

ELSIF D=0.0 THEN

C:=B;

ELSE

C:=D;

END_IF;

CASE selection CASE INT1 OF

1: BOOL1:=TRUE;

2: BOOL2:=TRUE;

ELSE

BOOL1:=FALSE;

BOOL2:=FALSE;

END_CASE;

FOR loop J:=101;

FOR I:=1 TO 100 BY 2 DO

IF ARR[I]=70 THEN

J:=I;

EXIT;

END_IF;

END_FOR;

WHILE loop J:=1;

WHILE J<=100 AND ARR[J]<>70 DO

J:=J+2;

END_WHILE;

REPEAT loop J:=-1;

REPEAT

J:=J+2;

UNTIL J= 101 OR ARR[J]=70

END_REPEAT;

EXIT EXIT;

Empty instruction ;

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Lenze DDS v2.0 Manuel d'utilisateur Page 15

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