Mitsubishi FX3G Series Programming Manual

490
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.5 FNC117 – EVAL / Character String to Floating Point Conversion
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
XYMTCSD
 .b KnX KnY KnM KnS T C D R U\G V Z Modify K H E "  "P
33333333 3 3
33 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

Mitsubishi FX3G Series Specifications

General

Model	FX3G Series
Power Supply	AC 100-240V or DC 24V
Program Capacity	32, 000 steps
Execution Speed	0.21 µs/basic instruction
Communication Options	RS-422, USB, Ethernet
Expansion Modules	Analog, digital, communication
Programming Language	Ladder Logic, Instruction List
Built-in Functions	High-speed counters, pulse output
Analog I/O	Available via expansion modules