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The mantissa is expressed as a value less than one, i.e., to seven decimal
places.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
First word
Exponent (0 to 7)
Sign of exponent
0: +
1: –
1
0
1
0
0
0
0
1
0
0
0
1
0
0
0
1
Mantissa (leftmost 3 digits)
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Second word
Mantissa (leftmost 4 digits)
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
= 0.1111111 x 10
–2
Flags
ER:
Dr and Dr+1 contain 0.
Dd, Dd+1, Dr, or Dr+1 is not BCD.
The result is not between 0.0000001 x 10
–7
and 0.999999 x 10
+7
.
Indirectly addressed DM word is non-existent. (Content of *DM word
is not BCD, or the DM area boundary has been exceeded.)
EQ:
ON when the result is 0.
The following example shows how to divide two whole four-digit numbers
(i.e., numbers without fractions) so that a floating-point value can be ob-
tained.
First the original numbers must be placed in floating-point form. Because the
numbers are originally without decimal points, the exponent will be 4 (e.g.,
3452 would equal 0.3452 x 10
4
). All of the moves are to place the proper
data into consecutive words for the final division, including the exponent and
zeros. Data movements for Dd and Dd+1 are shown at the right below.
Movements for Dr and Dr+1 are basically the same.The original values to be
divided are in DM 0000 and DM 0001. The final division is also shown.
Example
BCD Calculations
Section 5-17
Содержание SYSMAC C200H
Страница 1: ...OPERATION MANUAL C200H CPU01 E 03 E 11 E SYSMAC Programmable Controllers Cat No W130 E1 05 ...
Страница 2: ...C200H Programmable Controllers CPU01 E 03 E 11 E Operation Manual Revised June 2003 ...
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Страница 8: ...TABLE OF CONTENTS ix Glossary 345 Index 363 Revision History 369 ...
Страница 342: ...336 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage ...
Страница 374: ...Cat No W130 E1 05 C200H Programmable Controllers CPU01 E 03 E 11 E OPERATION MANUAL ...