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517
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.5 FNC117 – EVAL / Character String to Floating Point Conversion
11
FNC3
0-F
NC3
9
R
otati
on and
Shif
t
12
FNC4
0-F
NC4
9
D
ata
O
per
ati
on
13
FN
C
50-FN
C
59
H
igh Speed
Pr
ocess
ing
14
FM
C
60-
FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
N
C7
9
Ex
ter
nal
FX
I/O
D
evice
16
FN
C
80-FN
C
89
Ext
ernal FX
De
vic
e
17
FN
C
100-
FN
C
109
Da
ta
Transf
er 2
18
FN
C
110-
FN
C
139
Fl
oati
ng Poi
nt
19
FN
C
140
-F
N
C
14
9
Da
ta
O
per
ati
on 2
20
FN
C
150-
FN
C
159
Posit
ioning
C
ontr
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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 Subsection 26.2.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 32-bit operation (EVAL and EVALP)
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
3
3
3
3
3 3 3 3
3
3
3 3
3
3
−
−
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