484
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.12 FNC124 – EXP / Floating Point Exponent
18.12 FNC124 – EXP / Floating Point Exponent
Outline
This instruction executes exponential operation whose base is "e (2.71828)".
→
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 (DEXP and DEXPP)
The exponent of [
+1,
] is calculated, and the operation result is stored to [
+1,
].
A real number can be directly specified as
.
• In the exponential operation, the base (e) is set to "2.71828".
Error
An operation error occurs in the following case; The error flag M8067 turns ON, and the error code is stored in
D8067.
• When the operation result is outside the following range (error code: K6706)
2
−
126
≤
| Operation result |
<
2
128
Operand Type
Description
Data Type
Head device number storing binary floating point data used in exponential
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
3 3
3
3
3
3 3
3
3
P
FNC 124
EXP
D
−
−
Mnemonic
Operation Condition
16-bit Instruction
DEXP
DEXPP
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
S
D
S
D
S
S
D
D
S
Command
input
FNC124
DEXP
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
e
S
S
D
D