ST language commands
The ST language commands are ending by a semicolon. The EOL character is treated in the same way as the space character.
| Command | Description | Example |
|---|---|---|
| := | Assignment.\\ The value calculated on the right is assigned to the identifier on the left. | \\ A:=B; C:=SIN(X); My_FB(p1:=10, p2:=20);\\ |
| ⇒ | Assignment.\\ Value of the variable declared on the left is assigned to the identifier on the right. | \\ FB1( out1 => my_var );\\ |
| REF= | Reference.\\ Variable on the left is filled with reference to the value on the right. | \\ MyVar:= 100; MyRef REF= MyVar; MyRef:= 200;\\ |
| IF | Selection command.\\ If the BOOLean condition is met the associated command is executed. | \\ IF A>10 THEN B:=1;\\ ELSE B:=2;\\ END_IF;\\ |
| CASE | Selection command.\\ Execution of a block of commands if the CASE condition is met. | \\ CASE TW OF\\ 1,5: DISPLAY:=OVEN_TEMP;\\ 2: DISPLAY:=MOTOR_SPEED;\\ ELSE DISPLAY:=STATUS;\\ END_CASE;\\ |
| FOR | Iterative command.\\ A loop of block of commands with an initial value, end condition, and increment value.\\ | \\ FOR I:= 0 TO 10 BY 2\\ DO\\ J:=J+3;\\ END_FOR;\\ |
| WHILE | Iterative command.\\ A loop of block of commands with condition for exiting the loop at the beginning. | \\ WHILE J>10 DO\\ J:=J+2;\\ END_WHILE;\\ |
| REPEAT | Iterative command.\\ A loop of block of commands with condition for exiting the loop at the end. | \\ REPEAT\\ J:=J+2;\\ UNTIL J>10;\\ |
| EXIT | Exiting the loop.\\ Premature exiting of the command loop. | \\ EXIT;\\ |
| RETURN | Return.\\ Leaving of the currently executed block. | \\ RETURN;\\ |