Delta AH500 - Page 498

AH500 Programming Manual
6-330
API Instruction code Operand
Function
1504 FACOS P
S, D
Arccosine of the floating-point
number
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
S
         
D
        
Pulse instruction
16-bit instruction (5-6 steps)
32-bit instruction
AH500 AH500 -
Symbol:
S
：
Source value Double word
D
：
Arccosine value Double word
Explanation:
1. Arccosine value=cos
-1
The relation between cosine values and arccosine values are shown below.
2. If the absolute value of the conversion result is larger than the value which can be represented
by the maximum floating-point number, SM602 is ON.
3. If the absolute value of the conversion result is less than the value which can be represented
by the minimum floating-point number, SM601 is ON.
4. If the conversion result is 0, SM600 is ON.
Example:
When X0.0 is ON, the arccosine of the floating-point number in (D1, D0) is stored in (D11, D10). The
arccosine value in (D11, D10) is converted into the degree, and the conversion result is stored in
(D21, D20). The degree in (D21, D20) is converted into the integer, and the conversion result is
stored in (D31, D30). The integer in (D31, D30) is converted into the binary-coded decimal value,
and the conversion result is stored in Y0.15~Y0.0.