Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Instrukcja Użytkownika Pobierz pdf (Strona 201)

11–5Data Encoding

Publication

17706.5.16 - October 1996

Octal

The octal number system is another easy way to represent binary

data. This system uses the eight digits, 0 through 7. Each group of

three data bits represents one octal digit between 0 and 7. This factor

presents a slight conversion problem because bytes and words

usually contain an even number of bits. Thus, an 8-bit byte can have

an octal value between 0 and 377, while a 16-bit word can have an

octal value between 0 and 177777.

Each digit of an octal number has a place value that is a multiple

of 8. To convert from octal to decimal, multiply each octal digit

by its corresponding place value and add the results of the

multiplications.

Octal Representation of Decimal 239

1 x 2

= 2

1 x 2

= 1

1 x 2

= 4

0 x 2

= 0

1 x 2

= 1

1 x 2

= 4

1 x 2

= 2

1 x 2

= 1

111 01111

3 x 8

= 192

5 x 8

=40

7 x 8

= 357

239

Binary Floatingpoint

Use the binary floating-point numbering system when you want to

manipulate numbers outside of the range –32768 to +32768 or for a

resolution finer than one unit, for example 2.075.

SLC 5/03 OS300, SLC 5/04 OS400, and PLC-5 classic processors do

not support unnormalized, Not a Number (NaN), and infinity; PLC-5

enhanced processors support both NaN and infinity.

The valid range for a binary floating-point number is $3.402824 x

to $1.1754944 x 10

–38

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 250 251

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