Delta AH500 Programming Manual page 510

AH 5 00 Pr ogr am m ing Ma n ua l
API Instruction code
1514 FLOG
Device X
Y M
 
S
1
 
S
2
 
D
Symbol:
Explanation:
1. The logarithm of the value in S
result is stored in D.
2. The values in S and S
1
32-bit register, and the values in S
D
3. S =S .→D=Log S
1 2 S1
4. Example: Suppose the values in S
D
5. S =S .→5D=125.→D=log
1 2
6. 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 logarithm of the floating-point number in (D13, D12) with respect to the
floating-point number in (D11, D10) is calculated, and the operation result is stored in (D21,
D20).
6 - 3 4 2
Operand
P S , S , D
1 2
S T C HC D
   
   
   
Pulse instruction 16-bit instruction (7-9 steps) 32-bit instruction
AH500
： Device in which the base is stored
S
1
： Source device
S
2
Device in which the operation result is
D ：
stored
with respect to the value in S
2
only can be positive values. The register specified by D should be a
2
and S should be floating-point numbers.
1 2
2 .
and S are 5 and 125 respectively. Find log
1 2
125=3.
5
Logarithm of the floating-point
number
L SM SR E PR
  
  
  
AH500
is calculated, and the operation
1
Function
K 16# "$" DF


-
Double word
Double word
Double word
125.
5