Delta AS Series Programming Manual page 854

API Instruction code
1514 FLOG
Device X Y M
 
S
1
 
S
2

D
Data
type
S
1
S
2
D
Symbol
Explanation
1. This instruction calculates the logarithm of the value in S
precision floating-point operation result in D.
2. The values in S and S
1
.→D=Log
D
3. S =S S
1 2 S1 2.
4. Example: suppose the values in S
125).
.→5D=125.→D=log
D
5. S =S
1 2
6. If the operation result stored in D is 0, SM600 is ON.
Example
When X0.0 is ON, the DFLT instruction converts the values in (D1, D0) and (D3, D2) into the floating-point
1.
numbers, and stores the conversion results in (D11, D10) and (D13, D12) respectively.
When X0.1 is ON, the FLOG instruction calculates the logarithm of the floating-point number in (D13, D12) with
2.
Operand
P S , S , D
1 2
S T C HC
  
  
  
Pulse instruction
： Base for the logarithm
S
1
： Source value
S
2
Device where the operation result is
D ：
stored
only can be positive values.
2
and S are 5 and 125 respectively. Find log
1 2
125=3.
5
Ch ap te r 6 Ap pl ie d Instruc ti ons
Logarithm of a floating-point number
D FR SM SR
  
  
 



16-bit instruction
AS -
with respect to the value in S
2
125 (log base 5 of the number
5
Function
E K 16# "$" F


32-bit instruction
AS
, and stores the single-
1
6 - 5 7 5
6_