Delta AH500 - Page 512

AH500 Programming Manual
6-344
API Instruction code Operand
Function
1515 FLN P
S, D
Natural logarithm of the binary
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 -
Symbol:
S
：
Source device Double word
D
：
Device in which the operation result is stored Double word
Explanation:
1. The natural logarithm of the operand S is calculated.
2. LN[S+1, S]=[S+1, D]
3. The value in S only can be a positive value. The register specified by D should be a 32-bit
register, and the value in S should be a floating-point number.
4. e
D
=S.→The value in D=lnS. (S represents the source data.)
5. If the operation result stored in D is 0, SM600 is ON.
Example:
1. When X0.0 is ON, the value in (D1, D0) is converted into the floating-point number, and the
conversion result is stored in (D11, D10).
2. When X0.1 is ON, the natural logarithm of the floating-point number in (D11, D10) is calculated,
and the operation result is stored in (D21, D20).
Additional remark:
1. If the value in S is less than or equal to 0, the instruction is not executed, SM0 is ON, and the
error code in SR0 is 16#2003.