Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 183)

Message Formats

Appendix A

A21

Privileged Write

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

address. You use this command to download to a PLC–3 from 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 8.

Command Format:

DLE

SRC C

TNS

STX

FNC

DST

DLE ETX

BCC

DATA - Max of 238 bytes or 119 words

PLC-3

physical address

Reply Format:

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

A. Format when the command was successfully executed

DLE

SRC

STX DST C

TNS

DLE ETX

BCC

B. Format when reporting an error

ETX

ST S

DLE

SRC

STX DST C

TNS

DLE ETX

BCC

Where the extended status byte is optional.

From a computer you use this command to ask the 1775–KA module to

initiate either a PLC–3 shutdown (if the computer has download

privileges) or a freeze on file allocations (if the computer has upload

privileges). This command halts program and I/O scanning. You cannot

issue this command until you have successfully transmitted an upload or

download request to the 1775–KA module. This command has a function

code of 7.

1 2 ... 178 179 180 181 182 183 184 185 186 187 188 ... 238 239

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