L9E_ARSIN: Floating Point Arcsine 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_ARSIN DFB performs the arc sine 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 sine of the value
Node
Node Type
Name
Data Type
Address Range
Meaning
Top
IN
SINEVAL
ARRAY[1...2] OF UINT
%MW
floating point value indicating the sine of an angle
SINEVAL stores a floating point value indicating the sine of an angle between -Pi/2 through +Pi/2 radians.
This value must be in the range of -1.0 through +1.0; if not:
  • The arc sine is not computed.
  • An invalid result is returned.
  • An event is flagged in the L9E_ERLOG DFB.
Middle
IN/OUT
RESULT
ARRAY[1...4] OF UINT
%MW
Arc sine in radians of the value in SINEVAL
The arc sine 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 SINEVAL, since word 1 and 2 are not used.
Output Pin
Name
Data Type
Address Range
Meaning
Top
OUT
BOOL
–
ON = operation successful