Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 182)

Message Formats

Appendix A

A20

Where the extended status byte is optional.

A PLC–3 receives privileged commands from an RS–232–C device (such

as a computer); the PLC–3 does not send these commands. The

privileged commands are:

privileged read download request

privileged write upload request

diagnostic counters reset restart request

diagnostic loop set ENQs

diagnostic read set NAKs

diagnostic status set timeout

Privileged Read

Use this read command with a PLC–3 physical address as a starting

address. You use this command to upload from a PLC–3 to a computer.

The destination 1775–KA module will accept this command only after the

source station has successfully transmitted a shutdown request. The

function code for this command is 9.

Command Format:

DLE

SRC C

TNS

STX

FNC

SIZE

DST

DLE ETX

BCC

PLC-3

physical address

Reply Format:

TDATA–Max of 238 bytes or 119 words DLE ETX BCChis is the same

as the reply packet format for all reads.

A. Format when the command was successfully executed

DLE

TNS

STX

DLE ETX

BCC

DATA - Max of 244 bytes or 122 words

DST

SRC

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.

Privileged Commands

1 2 ... 177 178 179 180 181 182 183 184 185 186 187 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 182

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