AH500 Programming Manual
6-358
API Instruction code Operand
Function
1523 BACOS P
S, D
Arccosine of the binary-coded
decimal number
Device
X Y M S T C HC D L SM SR E PR K 16#
“$” DF
16-bit instruction (5 steps)
AH500 AH500 -
Symbol:
S
：
Source value Word
D
：
Arccosine value Word
Explanation:
1. The source value specified by S is a binary-coded decimal value, and the instruction is used to
get the arccosine of the source value specified by S. The operation result (the degree) is
stored in D.
2. The value in S represents the sign, i.e. 0 represents the positive sign, and 1 represents the
negative sign. The integer part is stored in S+1, and the fractional part is stored in S+2.
3. The operation result is rounded off to the nearest whole digit.
4. The operation result is a binary-coded decimal value (the degree) wiithin the range between 0°
and 180°.
Example:
The value in D0 represents the sign, the integer part is stored in D1, and the fractional part is stored
in D2. After the instruction BACOS is executed, the arccosine value is rounded off to the nearest
whole digit, and the result is stored in D10.
Binary-coded
decimal value
B
inary-coded
decimal value
Binary-coded
decimal value
Binary-coded
decimal value
0
0 0
0
0
0 0
0
8
6 0
6
D0
D1
D2
BACOS
0
0 0
3
D10
Additional remark:
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