Материал: m912201e
314 • The IEC Operators
Numeric Functions
12.10.6SIN
Returns the sine of a number.
IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 0.5
SIN
ST |
q |
(*Result is 0.479426 *) |
Example in ST:
q:=SIN(0.5);
Example in FBD:
12.10.7COS
Returns the cosine of number. The value is calculated in arch minutes.
IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type Typ REAL.
Example in IL:
LD 0.5
COS
ST |
q |
(*Result is 0.877583 *) |
Example in ST:
q:=COS(0.5);
Example in FBD:
12.10.8TAN
Returns the tangent of a number. The value is calculated in arch minutes. IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
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The IEC Operators |
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Numeric Functions |
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Example in IL:
LD 0.5
TAN
ST |
q |
(*Result is 0.546302 *) |
Example in ST:
q:=TAN(0.5);
Example in FBD:
12.10.9ASIN
Returns the arc sine (inverse function of sine) of a number. .
IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 0.5
ASIN
ST |
q |
(*Result is 0.523599 *) |
Example in ST:
q:=ASIN(0.5);
Example in FBD:
12.10.10ACOS
Returns the arc cosine (inverse function of cosine) of a number. The value is calculated in arch minutes.
IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 0.5
WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32
316 • The IEC Operators
Numeric Functions
ACOS
ST |
q |
(*Result is 1.0472 *) |
Example in ST:
q:=ACOS(0.5);
Example in FBD:
12.10.11ATAN
Returns the arc tangent (inverse function of tangent) of a number. The value is calculated in arch minutes.
IN can be type BYTE, WORD, DWORD, INT, DINT, REAL, SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 0.5
ATAN
ST |
q |
(*Result is 0.463648 *) |
Example in ST:
q:=ATAN(0.5);
Example in FBD:
12.10.12EXPT
Exponentiation of a variable with another variable:
OUT = IN1IN2.
IN1 and IN2 can be type BYTE, WORD, DWORD, INT, DINT, REAL,
SINT, USINT, UINT, UDINT, OUT must be type REAL.
Example in IL:
LD 7
EXPT 2
WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32
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Numeric Functions |
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ST |
var1 (*Result is 49 *) |
Example in ST:
var1 := EXPT(7,2);
Example in FBD:
WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32
318 • Standard Library Elements
String functions
13Standard Library Elements
13.1 String functions
Note:
String functions are not "thread safe": When using tasks, string functions may only be used in a single task. If the same function is used in different tasks, there is a danger of overwriting.
13.1.1LEN
Returns the length of a string. Input STR is of type STRING, the return value of the function is type INT.
Example in IL:
LD 'SUSI'
LEN
ST |
VarINT1 |
(* Ergebnis ist 4 *) |
Example in FBD:
Example in ST:
VarSTRING1 := LEN ('SUSI');
Note:
String functions are not "thread safe"
13.1.2LEFT
Left returns the left, initial string for a given string. Input STR is type
STRING, SIZE is of type INT, the return value of the function is type
STRING.
LEFT (STR, SIZE) means: Take the first SIZE character from the right in the string STR.
Example in IL:
LD 'SUSI'
LEFT 3
ST |
VarSTRING1 (* Ergebnis ist 'SUS' *) |
WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32