L9E_ARTAN: Floating Point Arc Tangent of an Angle (in Radians)
(Original Document)
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Naming
Name in LL984 Editor
Function Block Name
name of legacy 984 instruction
name in other tools and editors like:
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Function Description
The L9E_ARTAN DFB performs the arc tangent function on a floating point value and stores the result in an array.
Representation
Parameters
Input Pin
Name
Data Type
Address Range
Meaning
Top
ENABLE
BOOL
–
ON = calculates arc tangent of the value
Node
Node Type
Name
Data Type
Address Range
Meaning
Top
IN
TANVAL
ARRAY[1...2] OF UINT
%MW
floating point value indicating the tangent of an angle
TANVAL stores a floating point value indicating the tangent of an angle between -Pi/2 through +Pi/2 radians. Any valid floating point value is allowed.
Middle
IN/OUT
RESULT
ARRAY[1...4] OF UINT
%MW
arc tangent in radians of the value in TANVAL
The arc tangent in radians of the floating point value is posted in word 3 and 4.
Word 1 and 2 are not used but allocation is required.
Note: To preserve space, you can make the %MW reference numbers assigned to word 1 and 2 equal to TANVAL, since word 1 and 2 are not used.
Output Pin
Name
Data Type
Address Range
Meaning
Top
OUT
BOOL
–
ON = operation successful