Xinje XD Series User Manual

353
Double-precision math
function
Single-precision math
function
Description
double acos(double x);
float acosf(float x);
Inverse cosine function
double asin(double x);
float asinf(float x);
Inverse sine function
double atan(double x);
float atanf(float x);
Inverse tangent function
double atan2(double y,
double x);
float atan2f(float y, float
x);
Inverse tangent value of
parameter (y/x)
double ceil(double x);
float ceilf(float x);
Return the smallest double
integer which is greater or
equal with parameter x
double cos(double x);
float cosf(float x);
Cosine function
double cosh(double x);
float coshf(float x);
Hyperbolic cosine function,
cosh(x)=(e^x+e^(-x))/2
double exp(double x);
float expf(float x);
Exponent (e^x) of a nature data
double fabs(double x);
float fabsf(float x);
Absolute value of parameter x
double floor(double x);
float floorf(float x);
Return the largest double
integer which is smaller or
equals with x
double fmod(double x,
double y);
float fmodf(float x, float y);
If y is not zero, return the
reminder of floating x/y
double frexp(double val, int
_far *exp);
float frexpf(float val, int
_far *exp);
Break floating data x to be
mantissa and exponent x =
m*2^exp, return the mantissa
of m, save the logarithm into
exp.
double ldexp(double x, int
exp);
float ldexpf(float x, int
exp);
X multiply the (two to the
power of n) is x*2^n.
double log(double x);
float logf(float x);
Nature logarithm logic
double log10(double x);
float log10f(float x);
logarithm (log10x)
double modf(double val,
double *pd);
float modff(float val, float
*pd);
Break floating data X to be
integral part and decimal part,
return the decimal part, save
the integral part into parameter
ip.
double pow(double x, double
y);
float powf(float x, float y);
Power value of parameter y
(x^y)
double sin(double x);
float sinf(float x);
sine function
double sinh(double x);
float sinhf(float x);
Hyperbolic sine function,
sinh(x)=(e^x-e^(-x))/2
double sqrt(double x);
float sqrtf(float x);
Square root of parameter X
double tan(double x);
float tanf(float x);
Tangent function.
double tanh(double x);
float tanhf(float x);
hyperbolic tangent function
tanh(x)=(e^x-e^(-x))/(e^2+e^(-
x))
The using method of the functions in the table:
float asinf(float x);
float asinf: float means the return value is float format;
float x: float means the function formal parameter is float format. In actual using, it do not
need to write the float. See line 14 in the following example:
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Xinje XD Series Specifications

General

Input Voltage	24V DC
Storage Temperature	-20°C to 70°C
Protection Class	IP20
Type	PLC
Series	XD
Programming Language	Ladder Logic, Instruction List
Communication Interface	RS232, RS485
Power Supply	24V DC
Digital Inputs	Available (number varies by model)
Digital Outputs	Available (number varies by model)
Analog Inputs	Available (number varies by model)
Analog Outputs	Available (number varies by model)
Output Type	Relay, Transistor
Number of Inputs	Varies by model (see Digital Inputs and Analog Inputs)
Number of Outputs	Varies by model (see Digital Outputs and Analog Outputs)
Operating Temperature	0°C to 50°C
Humidity	5% to 95% (non-condensing)