Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 179)

Message Formats

Appendix A

A17

Reply Format:

This is the same as the reply packet format for all writes.

A. Format when successful execution.

DLE

SRC

STX DST C

TNS

DLE ETX

BCC

B. Format when reporting an error

DLE

SRC

STX DST C

TNS

DLE ETX

BCC

ETX

ST S

Where the extended status byte is optional.

File Read

Use this read command with either a file symbol or a block address for a

starting address. This starting address points to a file of words. This read

command reads a block of data. You must read the entire file. The file

size must equal the exact size of the file or an error will be returned. The

function code is 4.

Command Format:

A. File symbol address

DLE

SRC C

TNS

STX

FNC PACKET

DLE ETX

BCC

SIZE

OFFSET

TOTAL

TRANS

00DST

ASCII symbol

(8 characters max)

B. Logical address

DLE

SRC C

TNS

STX

FNC PACKET

DLE ETX

BCC

SIZE

OFFSET

TOTAL

TRANS

00DST

PLC-3 logical address

(2-51 bytes)

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 179

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