536
8 APPLICATION INSTRUCTION
8.9 Real Number Instruction
Processing details
• These instructions calculate the logarithm whose base is natural logarithm e 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 natural logarithm operation cannot be executed for a negative value).
• The table below shows the related devices.
Operation error
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
3402H
The specified device value is denormalized number, NaN (not a number), or
.
3405H
The value stored in a device specified in (s) is negative.
The value stored in a device specified in (s) is 0.
(s)+1
(s)
(d)+1
(d)
log ( )
Single-precision real number
Single-precision real number
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
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Page 1050: ...1048 26 TIME DATA FUNCTIONS 26 4 Division MEMO ...
Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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