Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 145)

Data Encoding and Addressing

Chapter 6

6-8

Figure 6.6

Results

of T

ransmitting Low Byte First

17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

10 01

10 0101110110

Value

Bit Number

(Octal)

A576 Hex

Odd, High Byte Even, Low Byte

PC W

ordA.

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

10 0110 0101110110

Value

Bit Number

(Decimal)

A576 Hex

Odd, High Byte Even, Low Byte

16-Bit Computer Word with Right-to-Left Byte and Bit Order

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15

01 0111 1010100101

Value

Bit Number

(Decimal)

A576 Hex

Even, High Byte Odd, Low Byte

16-Bit Computer Word with Left-to-Right Byte and Bit Order

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

01 0111 1010100101

Value

Bit Number

(Decimal)

A576 Hex

Even, High Byte Odd, Low Byte

16-Bit Computer Word with Left-to-Right Byte Order and Right-to-Left Bit Order

(after Byte

Swapping)

(after Byte

Swapping)

11396

There are three types of addressing a computer can use in command

messages that it transmits to PC stations:

Logical

Physical

Symbolic

Logical Addressing

You use logical addressing in commands that access PLC data table

memory only (non-privileged commands). For example, you use logical

Addressing

1 2 ... 140 141 142 143 144 145 146 147 148 149 150 ... 234 235

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