Mitsubishi MELSEC iQ-F FX5 series User Manual

460
7 APPLICATION INSTRUCTION
7.7 Real Number Instruction
Calculating the common logarithm of single-precision real
number
LOG10(P)/DLOG10(P)
These instructions calculate the common logarithm (the logarithm whose base is 10) of a value specified by (s), and store the
operation result in the device specified by (d).
The LOG10(P) instructions can also be used as DLOG10(P).
Setting data
■Descriptions, ranges, and data types
■Applicable devices
Processing details
• These instructions calculate the common logarithm (the logarithm whose base is 10) of a value specified by (s), and store
the operation result in the device specified by (d).
• Only a positive value can be set in (s). (The common logarithm operation cannot be executed for a negative value).
• The table below shows the related devices.
Operation error
Ladder diagram Structured text
ENO:=LOG10(EN,s,d);
ENO:=LOG10P(EN,s,d);
Operand Description Range Data type Data type (label)
(s) Data whose common logarithm is calculated or head device
number where the data is stored
 Single-precision real number Single-precision real number
(d) Head device number for storing the operation result  Single-precision real number Single-precision real number
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(s)   
(d)          
Device Name Description
Condition Operation
SM700 Carry The absolute value of the operation result  2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM700 turns on.
SM8020 Zero The operation result is true "0".
(The mantissa part is "0").
The zero flag SM8020 turns on.
SM8021 Borrow The absolute value of the operation result < 2
-126
The value of (d) is the minimum value (2
-126
) of 32-bit real
numbers and the borrow flag SM8021 turns on.
SM8022 Carry The absolute value of the operation result
 2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM8022 turns on.
Error code
(SD0/SD8067)
Description
3402 The specified device value is denormalized number, NaN (not a number), or .
3405 The value stored in a device specified in (s) is negative.
The value stored in a device specified in (s) is 0.
(s) (d)
log
10
( )(s)+1 (s) (d)+1 (d)
Single-precision real number Single-precision real number

Mitsubishi MELSEC iQ-F FX5 series Specifications

General

Brand	Mitsubishi
Model	MELSEC iQ-F FX5 series
Category	Controller
Language	English