Lenze DDS v2.3 - Manual (Page 41)

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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 the operand location
S
Set Set Boolean operand to TRUE exactly if the current result is TRUE.
R
Reset Set Boolean operand to FALSE exactly if the 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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