Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario descargar pdf (Pagina 175)

Message Formats

Appendix A

A13

PLC–3 stations can receive any of the commands in the basic command

set and execute them within a specified file in the PLC–3 memory. They

can also execute the following commands, which apply only to PLC–3

controllers:

bit write

word range read

word range write

file read

file write

Only a computer can send privileged commands. Their primary use is for

uploading and downloading PLC–3 memory.

Only a computer or another PLC–3 station can initiate the non–privileged

PLC–3 commands listed above. Their primary use is for transferring data

between two PLC–3 files. Those files may be located in the same PLC–3

processor or in two different PLC–3’s

Bit Write

Use this bit write command to modify the bits at the address specified by

either a word symbol, a file symbol plus a word offset, or a logical

address. This write command can write a block of data. This address

must point to a word within a file. The function code is 2. Unlike the

unprotected and protected bit writes in the basic command set, this

command can be used to change the bits in a single word only.

Command Format:

A. Word symbol address

DLE

SRC C

TNS

STX

FNC 00

ASCII sumbol

(8 characters max)

DLE ETX

BCC

W/F

SET

RESET

Mask

PLC-3 Commands

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual de usuario Pagina 175