Rockwell-automation Logix5000 Controllers Structured Text Programming Uživatelský manuál stáhnout pdf (Strana 38)

38 Publication 1756-PM007D-EN-P - November 2012

Chapter 1 Program Structured Text

For example:

Format Example

//comment At the beginning of a line

//Check conveyor belt direction

IF conveyor_direction THEN...

At the end of a line

ELSE //If conveyor isn’t moving, set alarm light

light := 1;

END_IF;

(*comment*) Sugar.Inlet[:=]1;(*open the inlet*)

IF Sugar.Low (*low level LS*)& Sugar.High (*high level LS*)THEN...

(*Controls the speed of the recirculation pump. The speed depends on the temperature in

the tank.*)

IF tank.temp > 200 THEN...

/*comment*/ Sugar.Inlet:=0;/*close the inlet*/

IF bar_code=65 /*A*/ THEN...

/*Gets the number of elements in the Inventory array and stores the value in the

Inventory_Items tag*/

SIZE(Inventory,0,Inventory_Items);

1 2 ... 33 34 35 36 37 38 39 40

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Rockwell-automation Logix5000 Controllers Structured Text Programming Uživatelský manuál Strana 38