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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.12 FNC124 – EXP / Floating Point Exponent
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
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
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
33 3 3 3
33 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
C
omman
d
input
FNC124
DEXP
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
e
S
S
D
D