Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Bedienungsanleitung PDF herunterladen (Seite 174)

Message Formats

Appendix A

A12

Unprotected Read

Use this command to read words of data from any area of PC data table

memory. Use the SIZE field to specify the number of bytes to be read.

To specify a number of PC words, SIZE should be an even value because

PC words are two bytes long.

Command Format:

DLE

SRC C

TNS

STX DLE ETX

BCC

ADDR SIZE

Reply Format:

DLE

SRC C

TNS

TNS ADDR

STX

DLE ETX

BCC

DATA - Max of 244 bytes

Unprotected Write

Use this command to write words of data into any area of PC data table

memory.

Command Format:

DLE

SRC C

TNS

TNS ADDR

STX

DLE ETX

BCC

DATA - Max of 242 bytes

Reply Format:

DLE

SRC C

TNS

STX DLE ETX

BCC

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Bedienungsanleitung Seite 174