Delta AH500 - Page 513

Chapter 6 Applied Instructions
6-345
API Instruction code Operand
Function
1516 FPOW P
S
1
, S
2
, D
A power of the floating-point
number
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
S
1
        

S
2
        

D
        
Pulse instruction
16-bit instruction (7-9 steps)
32-bit instruction
AH500
AH500
-
Symbol:
S
1
：
Device in which the base is stored Double word
S
2
：
Device in which the power is stored Double word
D
：
Device in which the operation result is
stored
Double word
Explanation:
1. The single-precision floating-point number in S
1
is raised to the power of the value in S
2
, and
the operation result is stored in D.
2. D=POW[S
1
+1, S
1
]
[
S2
+1,
S2
]
3. The value in S
1
only can be a positive value, whereas the value in S
2
can be a positive value or
a negative value. The register specified by D should be a 32-bit register, and the values in S
1
and S
2
should be floating-point numbers.
4. S
1
S2
=D
5. Suppose the values in S
1
and S
2
are 5 and 3 respectively. D=5
3
=125.
6. If the absolute value of the operation result is large than the value which can be represented
by the maximum floating-point number, SM602 is ON.
7. If the absolute value of the operation result is less than the value which can be represented by
the minimum floating-point number, SM601 is ON.
8. If the absolute value of the conversion result is large than the value which can be represented
by the maximum floating-point number, the value in D is 16#7F7FFFFF.
9. If the absolute value of the conversion result is less than the value which can be represented
by the minimum floating-point number, the value in D is 16#7F7FFFFF.
10. If the operation result stored in D is 0, SM600 is ON.
Example:
1. When X0.0 is ON, the values in (D1, D0) and (D3, D2) are converted into the floating-point
numbers, and the conversion results are stored in (D11, D10) and (D13, D12) respectively.
2. When X0.1 is ON, the floating-point number in (D11, D10) is raised to the power of the
floating-point number in (D13, D12), and the operation result is stored in (D21, D20).
3. When X0.2 is ON, the binary floating-point number in (D21, D20) is converted into the
binary-coded decimal floating-point number, and the conversion result is stored in (D31, D30).