Modifiers and Operators in IL

In the IL language the following operators and modifiers can be used.

Modifiers:

C	with JMP, CAL, RET:	The instruction is only then executed if the result of the preceding expression is TRUE. ·
N	with JMPC, CALC, RETC:	The instruction is only then executed if the result of the preceding expression is FALSE.
N	otherwise:	Negation of the operand (not of the accumulator) Below you find a table of all operators in IL with their possible modifiers and the relevant meaning:

Below you find a table of all operators in IL with their possible modifiers and the relevant meaning:

Operator	Modifiers	Meaning
LD	N	Make current result equal to the operand
ST	N	Save current result at the position of the operand
S		Then put the Boolean operand exactly at TRUE if the current result is TRUE
R		Then put the Boolean operand exactly at FALSE if the current result is TRUE
AND	N,(	Bitwise AND
OR	N,(	Bitwise OR
XOR	N,(	Bitwise exclusive OR
ADD	(	Addition
SUB	(	Subtraction
MUL	(	Multiplication
DIV	(	Division
GT	(	>
GE	(	>=
EQ	(	=
NE	(	<>
LE	(	<=
LT	(	<
JMP	CN	Jump to the label
CAL	CN	Call programor function block or
RET	CN	Leave POU and return to caller.
)		Evaluate deferred operation

Example of an IL program while using some modifiers:

LD	TRUE	(*load TRUE in the accumulator*)
ANDN	BOOL1	(*execute AND with the negated value of the BOOL1 variable*)
JMPC	mark	(*if the result was TRUE, then jump to the label “mark”*)
LDN	BOOL2	(*save the negated value of *)
ST	ERG	(*BOOL2 in ERG*)
label:
LD	BOOL2	(*save the value of *)
ST	ERG	*BOOL2 in ERG*)

It is also possible in IL to put parentheses after an operation. The value of the parenthesis is then considered as an operand.

For example:

LD  2

MUL 2

ADD 3

Erg

Here is the value of Erg 7. However, if one puts parentheses:

LD 2

MUL (2

ADD 3

)

ST Erg

The resulting value for Erg is 10, the operation MUL is only then evaluated if you come to “)”; as operand for MUL 5 is then calculated.