Iec 61131-3 Second edition 2003-01 Programmable controllers – Part 3: Programming languages

dependent
parameters.
It is an error if the result of evaluation of one of these functions exceeds the range of values specified
for the data type of the function output, or if division by zero is attempted.
Copyright International Electrotechnical Commission 
Provided by IHS under license with IEC
Not for Resale
No reproduction or networking permitted without license from IHS
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61131-3 
 IEC:2003(E)
– 57 –
Table 23 - Standard functions of one numeric variable
Graphical form
Usage example
+---------+
* ---| ** |--- *
+---------+
(*) - Input/Output (I/O) type
(**) - Function name
A := SIN(B) ;
(ST language - see 3.3)
No.
Function name
I/O type
Description
General functions
1
ABS
ANY_NUM
Absolute value
2
SQRT
ANY_REAL
Square root
Logarithmic functions
3
LN
ANY_REAL
Natural logarithm
4
LOG
ANY_REAL
Logarithm base 10
5
EXP
ANY_REAL
Natural exponential
Trigonometric functions
6
SIN
ANY_REAL
Sine of input in radians
7
COS
ANY_REAL
Cosine in radians
8
TAN
ANY_REAL
Tangent in radians
9
ASIN
ANY_REAL
Principal arc sine
10
ACOS
ANY_REAL
Principal arc cosine
11
ATAN
ANY_REAL
Principal arc tangent
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Not for Resale
No reproduction or networking permitted without license from IHS
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– 58 –
61131-3 
 IEC:2003(E)
Table 24 - Standard arithmetic functions
Graphical form
Usage example
+-----+
ANY_NUM ---| *** |--- ANY_NUM
ANY_NUM ---| |
. ---| |
. ---| |
ANY_NUM ---| |
+-----+
(***) - Name or Symbol
A := ADD(B,C,D) ;
or
A := B+C+D ;
No.
 d,e
Name
Symbol
Description
Extensible arithmetic functions
12
 g
ADD
+
OUT := IN1 + IN2 + ... + INn
13
MUL
*
OUT := IN1 * IN2 * ... * INn
Non-extensible arithmetic functions
14
 g
SUB
-
OUT := IN1 - IN2
15
 c
DIV
/
OUT := IN1 / IN2
16
 a
MOD
OUT := IN1 modulo IN2
17
 b
EXPT
**
Exponentiation: OUT := IN1
IN2
18
 f
MOVE
:=
OUT := IN
NOTE 1
Non-blank entries in the Symbol column are suitable for use as operators in textual
languages, as shown in tables 52 and 55.
NOTE 2
The notations IN1, IN2, ..., INn refer to the inputs in top-to-bottom order; OUT
refers to the output.
NOTE 3
Usage examples and descriptions are given in the ST language defined in 3.3.
a
IN1 and IN2 shall be of generic type ANY_INT for this function. The result of evaluating this
function shall be the equivalent of executing the following statements in the ST language as
defined in 3.3:
IF (IN2 = 0) THEN OUT:=0 ; ELSE OUT:=IN1 - (IN1/IN2)*IN2 ; END_IF
b
IN1 shall be of type ANY_REAL, and IN2 of type ANY_NUM for this function. The output shall be
of the same type as IN1.
c
The result of division of integers shall be an integer of the same type with truncation toward zero,
for instance, 7/3 = 2 and (-7)/3 = -2.
d
When the named representation of a function is supported, this shall be indicated by the suffix “n”
in the compliance statement. For example, “12n” represents the notation “ADD”.
e
When the symbolic representation of a function is supported, this shall be indicated by the suffix
“s” in the compliance statement. For example, “12s” represents the notation “+”.
f
The MOVE function has exactly one input (IN) of type ANY and one output (OUT) of type ANY.
g
The generic type of the inputs and outputs of these functions is ANY_MAGNITUDE.
Copyright International Electrotechnical Commission 
Provided by IHS under license with IEC
Not for Resale
No reproduction or networking permitted without license from IHS
--``````-`-`,,`,,`,`,,`---

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61131-3 
 IEC:2003(E)
– 59 –