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Programming languages

4-3

l DDS EN 2.3

The table lists some IL operators along with possible modifiers and their respective meaning:

Operator Modifiers Meaning

LD N (=”NOT”) Load Load instruction

ST N Store Save the current result in t he operand location

S Set Set Boolean operand to TRUE exactly if t he current result is TRUE.

R Reset Set Boolean operand to FALSE exactly if t he current result is TRUE.

AND N,( Bit-by-bit AND

OR N,( Bit-by-bit OR

XOR N,( Bit-by-bit exclusive OR

ADD ( Addition

SUB ( Subtraction

MUL ( Multiplication

DIV ( Division

GT ( > Greater than

GE ( >= Greater than or equal to

EQ ( = Equal to

NE ( <> Not equal to

LE ( <= Less than or equal to

LT ( < Less than

JMP/JMPC N Jump Jump to label

CAL/CALC N Call Call program or function block

RET/RETC N Return Return from calling a function block

) Evaluate operation that has been deferred

For a more comprehensive IEC operator list refer chapter 12.

Example

IL program using several modifiers

LD TRUE (* Load TRUE to the accumulator *)

ANDN BOOL1 (* Execute AND with the negated value

of the variable BOOL1 *)

JMPC label (* If the result was TRUE

jump to the label “label” *)

LDN BOOL2 (* save the negated value of *)

ST ERG (* BOOL2 in ERG *)

Label:

LD BOOL2 (* save the value of *)

ST ERG (* BOOL2 in ERG *)

IL also allows the setting of parentheses after an operation. The value in parentheses is taken as

operand.

Example 1 Example 2

LD 2 LD 2

MUL 2 MUL (2

ADD 3 ADD 3

)

ST Result ST

• In example 1, the value of Result is 7.

• In example 2 with parentheses the value for Result is 10, because the operation MUL will

only be evaluated on reaching ”)”; the operand for MUL is 5.

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