Mitsubishi Electronics FX3G User Manual

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FX
3S
/FX
3G
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3GC
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3U
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3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.14 FNC126 – LOG10 / Floating Point Common Logarithm
11
FN
C30
-FN
C3
9
R
ota
tion and 
Shi
ft
12
FN
C40-FN
C49
D
ata O
perati
on
13
FNC
50-FNC
59
High-Speed
 
Proc
essing
14
FM
C60-FN
C69
H
andy 
In
struction
15
FN
C70-FN
C79
E
xternal
 F
X
 I/O
 
De
vice
16
FNC
80-FNC
89
External
 FX 
Dev
ice
17
FNC1
00-
FNC10
9
Dat
Transfer 2
18
FNC1
10-
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
 
Operation 2
20
FNC1
50-
FNC159
Pos
itioning 
Control
18.14 FNC126 – LOG10 / Floating Point Common Logarithm
Outline
This instruction executes the common logarithm operation.
→ For handling of floating point, refer to Subsection 5.1.3.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 32-bit operation (DLOG10 and DLOG10P)
Common logarithm [logarithm whose base is "10"] of [
+1, 
] is calculated, and the operation result is
stored to [
+1, 
].  A real number can be directly specified as 
.
• Only a positive value can be set in [
+1, 
].  (The common logarithm operation cannot be executed for a 
negative value.)
Errors
An operation error occurs in the following cases; The error flag M8067 turns ON, and the error code is stored in
D8067.
• When a negative value is specified in 
 (error code: K6706)
• When "0" is specified in 
 (error code: K6706)
Operand Type
Description
Data Type
Head device number storing binary floating point data used in the common logarithm
operation
Real number (binary)
Head device number storing the operation result
Oper-
and 
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special 
Unit
Index
Con-
stant
Real 
Number
Charac-
ter String
Pointer
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
V Z Modify K H
E
" "
P
P
FNC 126
LOG10
D

Mnemonic
Operation Condition
16-bit Instruction
DLOG10
DLOG10P
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
  S
  D
  S
  D
   
S
   
S
   
D
   
D
   
S
Command
input
FNC126
DLOG10
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
log
10
   
S
   
S
   
S
   
S