Rockwell-automation Logix5000 Controllers Structured Text Programming Manuale Utente Scaricare il pdf (Pagina 27)

Publication 1756-PM007D-EN-P - November 2012 27

Program Structured Text Chapter 1

Example

The [:=] tells the controller to also clear the outlet tags whenever the

controller:

• enters the Run mode.

• leaves the step of an SFC if you configure the SFC for Automatic reset.

(This applies only if you embed the assignment in the action of the step

or use the action to call a structured text routine via a JSR instruction.)

If you want this Enter this structured text

If recipe number = 1 then

CASE recipe_number OF

Ingredient A outlet 1 = open (1)

1: Ingredient_A.Outlet_1 :=1;

Ingredient B outlet 4 = open (1)

Ingredient_B.Outlet_4 :=1;

If recipe number = 2 or 3 then

2,3: Ingredient_A.Outlet_4 :=1;

Ingredient A outlet 4 = open (1)

Ingredient_B.Outlet_2 :=1;

Ingredient B outlet 2 = open (1)

If recipe number = 4, 5, 6, or 7 then

4..7: Ingredient_A.Outlet_4 :=1;

Ingredient A outlet 4 = open (1)

Ingredient_B.Outlet_2 :=1;

Ingredient B outlet 2 = open (1)

If recipe number = 8, 11, 12, or 13 then

8,11..13 Ingredient_A.Outlet_1 :=1;

Ingredient A outlet 1 = open (1)

Ingredient_B.Outlet_4 :=1;

Ingredient B outlet 4 = open (1)

Otherwise all outlets = closed (0)

ELSE

Ingredient_A.Outlet_1 [:=]0;

Ingredient_A.Outlet_4 [:=]0;

Ingredient_B.Outlet_2 [:=]0;

Ingredient_B.Outlet_4 [:=]0;

END_CASE;

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Rockwell-automation Logix5000 Controllers Structured Text Programming Manuale Utente Pagina 27