22: L
OGARITHM
/ P
OWER
I
NSTRUCTIONS
22-2
FT1A S
MART
A
XIS
U
SER
’
S
M
ANUAL
FT9Y-B1382
LOG10 (Common 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 LOG10 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: LOG10
log
10
S1·S1+1
D1·D1+1
When input is on, the common logarithm of the binary data designated by source device S1 is
stored to the destination designated by device D1.
LOG10(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 common 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 common 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
10
0.0000278
–4.555955
I1
S1
D10
LOG10(F)
D1
D20
SOTU
D1
S1
0.0000278
D10·D11
–4.555955
D20·D21
Summary of Contents for microsmart pentra
Page 1: ...FT1A SERIES FC9Y B1382 Ladder Programming Manual ...
Page 6: ...Preface 5 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 104: ...7 DATA COMPARISON INSTRUCTIONS 7 10 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 122: ...8 BINARY ARITHMETIC INSTRUCTIONS 8 18 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 138: ...10 SHIFT ROTATE INSTRUCTIONS 10 12 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 162: ...11 DATA CONVERSION INSTRUCTIONS 11 24 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 188: ...12 CALENDAR COMPARISON INSTRUCTIONS 12 26 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 198: ...15 REFRESH INSTRUCTIONS 15 4 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 202: ...16 INTERRUPT CONTROL INSTRUCTIONS 16 4 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...
Page 266: ...20 DUAL TEACHING TIMER INSTRUCTIONS 20 4 FC5A MICROSMART USER S MANUAL FC9Y B1273 ...
Page 318: ...25 USER COMMUNICATION INSTRUCTIONS 25 22 FT1A SMARTAXIS USER S MANUAL FT9Y B1382 ...