Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Bedienungsanleitung PDF herunterladen (Seite 198)

11–2 Data Encoding

Publication

17706.5.16 - October 1996

In general, PLC processors store binary data (1s and 0s) in 16-bit

groups called words. If you are looking at this data from a

computer, however, you may interpret it in a number of different

ways, depending on your application needs. You may use any one of

the following numbering systems to represent data in your computer

application programs:

Numbering System Page

decimal 11-2

binary 11-3

binary coded decimal 11-3

hexadecimal 11-4

octal 11-5

binary floating point

11-5

Important: You must design your computer application programs to

make any necessary conversions from one numbering

system to another. Once you have selected the

numbering system that is best for your applications,

use that numbering system and convert all data values

to that base.

Decimal

The decimal numbering system is easy to use because it is most

familiar. It uses the digits 0 through 9, and each digit has a place

value that is a power of 10. Despite the convenience of decimal

numbers, it is often easier to convert binary data to a numbering

system other than decimal.

Decimal Representation, Number 239

2 x 10

= 200

3 x 10

= 30

9 x 10

= 9

239

Numbering Systems

1 2 ... 193 194 195 196 197 198 199 200 201 202 203 ... 250 251

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Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Bedienungsanleitung Seite 198