Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Pobierz pdf (Strona 177)

Message Formats

Appendix A

A15

Word Range Read

Use this read command with a word symbol, a file symbol plus a word

offset, or a block address as a starting address. This starting address must

point to a word in a file. This read command can read a block of data.

The function code is 1. A special case of this command is the

single–word read, where the number of bytes to read is only two bytes

(one word).

Command Format:

A. Word symbol address

DLE

SRC C

TNS

STX

FNC PACKET

ASCII symbol

(8 characters max)

DLE ETX

BCC

W/F

SIZE

OFFSET

TOTAL

TRANS

00DST

B. File symbol address plus word offset

DLE

SRC C

TNS

STX

FNC PACKET

ASCII symbol

(8 characters max)

DLE ETX

BCC

W/F

SIZE

OFFSET

TOTAL

TRANS

00DST

WORD

OFFSET

C. Logical Address

DLE

SRC C

TNS

STX

FNC PACKET

PLC-3 logical symbol

(2-51 bytes)

DLE ETX

BCC

SIZE

OFFSET

TOTAL

TRANS

DST

Reply Format:

This is the same as he reply packet format for all reads.

A. Format when successful execution

DLE

TNS

STX

DLE ETX

BCC

DATA - Max of 244 bytes or 122 words

DST

SRC

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 238 239

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