Structured Text (ST)

ST is a high-level language. ST syntactically is an adapted Pascal. In ST standard program, components are used instead of Pascal procedures. For those who is familiar with C language, it won't be difficult to cope with ST. Let's compare equivalent programs written in ST and С to illustrate it:

ST:

WHILE counter <> 0 DO

   counter := counter - 1;

   var1 := var1 * 2;

   IF var1 > 100 THEN

       var1 := 1;

       var2 := var2 + 1;

    END_IF

END WHILE

ST language is used for describing actions and SFC transition conditions. It's the most powerful tandem that allows solving any task.

Was this page helpful?