Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 82)

Message Packet Formats

Chapter 5

5-3

The message bytes contain unsigned binary data from both the application

layer and the network layer. Figure 5.2 shows the general format of a

command message.

Figure 5.2

Command

Message Packet Format

CMD STS FNC

ADDR

SIZE OR

DST SRC CMD STS TNS

From

Application

Layer

11329A

Network

Layer

Packet

Legend: x = low hex digit of CMD byte supplied by application layer

DATA0

Command Block

(0)

Not all command messages have FNC, ADDR, SIZE, or DATA bytes.

Figure 5.3 shows the general format of a reply message. The definitions

of these bytes are the same as those for command messages. Not all reply

messages have DATA or EXT STS bytes.

Figure 5.3

Message Packet Format

CMD STS DATA

DST SRC CMD STS TNS

Response Block

(From Application Layer)

From

Application

Layer

11330A

Network

Layer

Packet

Legend: x = low hex digit of CMD byte supplied by application layer

EXT

STS

Note that the bytes are shown from left to right in the order in which they

are transmitted across the link.

Message Packets

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 234 235

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