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Mitsubishi Electronics FX3G User Manual

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 Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.5 FNC117 – EVAL / Character String to Floating Point Conversion
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
a 
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
18.5
FNC117 – EVAL / Character String to Floating Point Conversion
Outline
This instruction converts a character string (ASCII codes) into binary floating point data.
On the other hand, the VAL (FNC201) instruction converts a character string (ASCII codes) into binary data.
→ For a character string, refer to Section 5.3.
→ For handling of floating point, refer to Subsection 5.1.3.
→ For VAL (FNC201) instruction, refer to Section 26.2.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 32-bit operation (DEVAL and DEVALP)
A character string stored in 
 and later is converted into binary floating point, and stored to [
+1, 
].
A specified character string may be in the decimal point format or exponent format.  A character string in either format
can be converted into binary floating point data.
Operand Type
Description
Data Type
Head device number storing character string data to be converted into binary floating point
data
Character string
Head device number storing converted binary floating point data
Real number (binary)
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
−
−
Mnemonic
Operation Condition
16-bit Instruction
DEVAL
DEVALP
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
P
FNC 117
EVAL
D
  S
  D
  S
  D
   
S
   
D
   
D
Command
input
FNC117
DEVAL
S 
D 
ASCII code for 1st character
b15
b8 b7
b0
+1
+2
+3
+4
ASCII code for 3rd character
ASCII code for 5th character
ASCII code for 7th character
ASCII code for sign
ASCII code for 2nd character
ASCII code for 4th character
ASCII code for 6th character
Indicates the end of the character string.
+1
Binary floating point
(real number)
S 
D 
S 
S 
S 
S 
D 
00H