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F322
(LOG)
P322
(PLOG)
Outline
This instruction calculates the logarithm of a floating point real number
LOG( ).
For the FP0R/FPΣ/FP−X/FP0/FP−e, the P type high−level instruction
"P322 (PLOG)" is not available.
Program example
Trigger
R0
10
F322 LOG, DT10, DT20
S
D
Operands
Relay
Operand
Operand
WX WY WR WL
S
A
A
D
N/A
A
Description
The logarithm LOG(S+1 and S) is calculated of the data specified in S+1 and S, and the result is stored in D+1
and D.
LOG ([S+1, S]) → [D+1, D]
Specifying the integer device with [S], the integer data is internally converted to real numbers before
operations continue.
R0
F322 LOG, % DT 0, DT 4
Specifying the integer device with [D], the real numbers are automatically converted into integer data.
R0
F322 LOG, DT 0, % DT 4
When the constant K is specified in S, the operations are the same as when a integer device is specified.
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Floating point data logarithm
Ladder Diagram
Ladder Diagram
S
D
Angle data (2 words) or lower 16-bit area of 32-bit data where angle data is
stored
Lower 16-bit area of 32-bit data where calculated result is stored
Timer/Counter
SV
EV
A
A
A
A
A
A
A
A
Index
Register
register
DT
LD
FL
I
A
A
A
A
A
A
A
A
* Index modification of a real number is not possible.
High−level Instructions
Boolean
Address
Instruction
10
ST
R
11
F322
DT
DT
Constant
Index
modifier device
modifier
K
H
f
A
A
A
A*
N/A N/A N/A
A
A:
Available
N/A: Not Available
0
(LOG)
10
20
Integer
device
A
A
3 − 707
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