Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 824

Processing details
• These instructions calculate the exponent of the value specified by (s), and store the operation result in the device specified
by (d).
(s)+3 (s)+2
(
Double-precision real number
• Exponent operation is performed with the base (e) set to "2.71828".
• If the operation result is -0 or an underflow occurs, the operation result turns out to 0.
• When an input value is set using the engineering tool, a rounding error may occur. Refer to the following for the precautions
on setting input values using the engineering tool.
Page 49 Precautions
Operation error
Error code Description
(SD0)
The value input to (s) is -0, a subnormal number, NaN (not a number), or .
3402H
3403H The data output from (d) exceeds the following range. (An overflow has occurred.)
|(d)|<2
• The EXPD(P) instruction performs operation using the natural logarithm. To determine a value using the
common logarithm, determine a value by dividing the common logarithm value by 0.43429 and specify it in
the device specified by (s).
X
10
7 APPLICATION INSTRUCTIONS
822
7.9 Real Number Instructions
(s)+1 (s)
)
1024
X
0.43429
= e
(d)+3 (d)+2 (d)+1 (d)
( )
Double-precision real number