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Description
The STEP 7 Micro/WIN standard library does include the trigonometric functions sine, cosine and tangent in floating point arithmetic. However, their inverse functions, the so-called arc functions, are not available in the standard library.
The arc functions - arc sine, arc cosine, arc tangent - are available for downloading at the end of this entry in the form of a STEP 7 Micro/WIN library.
Description of the "Arc functions" library
Fig. 1: Arc functions library in STEP 7 Micro/WIN
The arc sine function (ARCSIN)
The arc sine function is the inverse function of the sine function:
y = arcssin (x) = sin-1(x)
Fig. 2: ARCSIN
| Parameter |
Data type |
Function |
| Input |
[REAL] |
Function value x: Angle specification in radian measure |
| Output |
[REAL] |
Function value y: Angle output in radian measure |
Table 1: Parameters of ARCSIN
Converting from radians to degrees
Angle[radian] = (Angle[degree] * PI) / 180
The arc cosine function (ARCCOS)
The arc cosine function is the inverse function of the cosine function:
y = arccos (x) = cos-1(x)
Fig. 3: ARCCOS
| Parameter |
Data type |
Function |
| Input |
[REAL] |
Function value x: Angle specification in radian measure |
| Output |
[REAL] |
Function value y: Angle output in radian measure |
Table 2: Parameters of ARCCOS
Converting from degrees to radians
Angle[radian] = (Angle[degree] * PI) / 180
The arc tangent function (ARCTAN)
The arc tangent function is the inverse function of the tangent function:
y = arctan (x) = tan-1(x)
Fig. 4: ARCTAN
| Parameter |
Data type |
Function |
| Input |
[REAL] |
Function value x: Angle specification in radian measure |
| Output |
[REAL] |
Function value y: Angle output in radian measure |
Table 3: Parameters of ARCTAN
Converting from radians to degrees
Angle[radian] = (Angle[degree] * PI) / 180
The STEP 7 Micro/WIN library as archive file
Copy the "arcusfunctions.exe" file into a separate directory and then start the file with a double-click. The STEP 7 Micro/WIN library is then unpacked. You can then integrate the library, which can be used in version V3.2.4.27 and higher of STEP 7 Micro/WIN, into your S7-200 project.
Notes
- Information about inserting libraries in STEP 7 Micro/WIN is available in
Entry ID: 16689345
 arcusfunctions.exe ( 36 KB )
Addition Keywords
Arc tangent, Arc cosine, Arc sine, Arc function
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