FT1A S
MART
A
XIS
U
SER
’
S
M
ANUAL
FT9Y-B1382
22-1
22: L
OGARITHM
/ P
OWER
I
NSTRUCTIONS
Introduction
This chapter describes logarithm and power instructions which are used to calculate logarithm or powered values of source
devices.
LOGE (Natural Logarithm)
Applicable CPU Modules
Valid Devices
For the valid device address range, see pages 6-1 and 6-2 (Basic Vol.).
When the operation result is not within the range between –3.402823
10
38
and –1.175495
10
–38
or between 1.175495
10
–38
and 3.402823
10
38
, special internal relay M8003 (carry or borrow) is turned on except when the result is 0. For details, see Chapter 4 “Carry and Borrow in
Floating-Point Data Processing” on page 4-18.
When the value of S1 (source 1) is 0, a user program execution error occurs and an infinity is stored in D1.
When the value of S1 (source 1) is less than 0, a user program execution error occurs and a non-numeric value is stored in D1.
When the data designated by source device S1 does not comply with the normal floating-point format, a user program execution error occurs, and
the execution of the instruction is canceled. The value of D1 is left unchanged and the next instruction is executed.
When a user program execution error occurs, special internal relay M8004 and ERR LED on the CPU module are turned on. For details about the
user program execution errors, see Chapter 4 “User Program Execution Errors” on page 4-21.
Since the LOGE instruction is executed in each scan while input is on, a pulse input from a SOTU or SOTD instruction should be used as required.
Valid Data Types
Example: LOGE
log
e
S1·S1+1
D1·D1+1
When input is on, the natural logarithm of the binary data designated by source device S1 is
stored to the destination designated by device D1.
LOGE(F)
S1
*****
D1
*****
FT1A-12
FT1A-24
FT1A-40
FT1A-48
FT1A-Touch
X
X
X
X
X
Device
Function
I
Q
M
R
T
C
D
Constant
Repeat
S1 (Source 1)
Binary data to convert into natural logarithm
—
—
—
—
—
—
X
X
—
D1 (Destination 1)
Destination to store conversion results
—
—
—
—
—
—
X
—
—
W (word)
—
Since the floating point data type is used, the source and destination devices use two consecutive data registers.
I (integer)
—
D (double word)
—
L (long)
—
F (float)
X
When input I1 is on, the natural logarithm of the binary data of data registers D10 and
D11 designated by source device S1 is stored to data registers D20 and D21 designated
by destination device D1.
log
e
86.0
4.454347
I1
S1
D10
LOGE(F)
D1
D20
SOTU
D1
S1
86.0
D10·D11
4.454347
D20·D21
Содержание microsmart pentra
Страница 1: ...FT1A SERIES FC9Y B1382 Ladder Programming Manual ...
Страница 6: ...Preface 5 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 104: ...7 DATA COMPARISON INSTRUCTIONS 7 10 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 122: ...8 BINARY ARITHMETIC INSTRUCTIONS 8 18 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 138: ...10 SHIFT ROTATE INSTRUCTIONS 10 12 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 162: ...11 DATA CONVERSION INSTRUCTIONS 11 24 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 188: ...12 CALENDAR COMPARISON INSTRUCTIONS 12 26 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 198: ...15 REFRESH INSTRUCTIONS 15 4 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 202: ...16 INTERRUPT CONTROL INSTRUCTIONS 16 4 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Страница 266: ...20 DUAL TEACHING TIMER INSTRUCTIONS 20 4 FC5A MICROSMART USER S MANUAL FC9Y B1273 ...
Страница 318: ...25 USER COMMUNICATION INSTRUCTIONS 25 22 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...