Mitsubishi A1SD51S, Руководство по программированию

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MELSEC-Q
11 INSTRUCTIONS AND FUNCTIONS
CISN
Function
Convert Integer to SiNgle
• Converts a 2-word (32-bit) integer to be used by the PLC CPU into a single precision real
number.
CISN ( <array variable> )
Syntax
array variable • • • • Specify a one-dimensional integer array variable
where the converting data is stored.
A!=CISN(B%(0)) • • • • Converts an integer value in B%(0) and B%(1) into a
single precision and stores in A!.
Examples
L
H
L
H
B%(0)
B%(1)
A!
Lower word
Higher word
32 bits
Description
• The CISN function converts a 2-word (32-bit) integer to be used by the PLC CPU into a
single precision real number.
• <array variable> uses a one dimensional integer array variable.
An "Illegal function call" error occurs if anything other than one dimensional integer array is
specified.
Be sure to define the variable to be used for <array variable> by the DIM instruction.
An "Illegal function call" error occurs if it is not defined by the DIM instruction.
• Accuracy of the single precision real number, which was converted from a 2-word (32-bit)
integer, is the same as the accuracy before the CISN function was executed. (The number
of effective digits is six.)
• The following shows how to handle 2-word (32-bit) integer to be used by the PLC CPU in
BASIC:
Example
PLC
CPU
2-word integer
y y y y
Stores in the data register.
x x x x Dn
Dn+1
BASIC
PCRD (control table) , %( )
%(n)
%(n+1)
Converts into a double
precision real number.
!
For <control table>,
see process code
1 of the PCRD instruction.
CISN