Chapter 6 Applied Instructions API 1504 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. 6-331 Instruction code Operand Function 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 -