Mitsubishi Electronics FX3G Video Gaming Accessories User Manual


 
509
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.13 FNC125 – LOGE / Floating Point Natural Logarithm
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
18.13 FNC125 – LOGE / Floating Point Natural Logarithm
Outline
This instruction executes the natural logarithm operation.
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 (DLOGE and DLOGEP)
Natural logarithm [logarithm whose base is "e (2.71828)"] of [ +1, ] is calculated, and the operation result
is stored to [ +1, ]. A real number can be directly specified as .
Only a positive value can be set in [ +1, ]. (The natural logarithm operation cannot be executed for a
negative value.)
Errors
An operation error is caused in the following cases; The error flag M8067 turns ON, and the error code is stored in
D8067.
When a negative value is specified in (error code: K6706)
When "0" is specified in (error code: K6706)
Operand Type Description Data Type
Head device number storing binary floating point data used in the natural logarithm
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 125
LOGE
D
Mnemonic Operation Condition
16-bit Instruction
DLOGE
DLOGEP
Mnemonic Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Operation
S
D
S
D
S
S
D
D
S
Command
input
FNC125
DLOGE
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
log
e
S
S
D
D
S
S
S
S