Documentation

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;

ST language commands