686 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Appendix C Structured Text Programming
Example
The [:=] tells the controller to also clear the outlet tags whenever the controller
does the following:
• 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
Ingredient A outlet 1 = open (1)
Ingredient B outlet 4 = open (1)
CASE recipe_number OF
1:
Ingredient_A.Outlet_1 :=1;
Ingredient_B.Outlet_4 :=1;
If recipe number = 2 or 3 then
Ingredient A outlet 4 = open (1)
Ingredient B outlet 2 = open (1)
2,3:
Ingredient_A.Outlet_4 :=1;
Ingredient_B.Outlet_2 :=1;
If recipe number = 4, 5, 6, or 7 then
Ingredient A outlet 4 = open (1)
Ingredient B outlet 2 = open (1)
4…7:
Ingredient_A.Outlet_4 :=1;
Ingredient_B.Outlet_2 :=1;
If recipe number = 8, 11, 12, or 13 then
Ingredient A outlet 1 = open (1)
Ingredient B outlet 4 = open (1)
8,11…13
Ingredient_A.Outlet_1 :=1;
Ingredient_B.Outlet_4 :=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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