Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 117)

Message Packet Formats

Chapter 5

5-38

The above are privileged commands. This means that only a computer

can execute them. Their primary purpose is for uploading and

downloading PLC-4 memory.

PLC-4 stations cannot initiate any type of command message.

In addition to the message packet fields already described for the basic

command set (see “Message Packets”), PLC-4 messages may also contain

a byte called PLC-4 SEL. This field specifies which controller in the

PLC-4 Microtrol loop is the ultimate destination of the command

message. The allowed values for this field are:

PLC-4

SEL V

alue Meaning

Selects Controller #1

Selects Controller #2

Selects Controller #3

Selects Controller #4

Selects Controller #5

Selects Controller #6

Selects Controller #7

Selects Controller #8

Allocate

This command causes the 1773-KA module to allocate PLC-4 access

privileges to the computer station that originated the allocate commands.

Once the computer has this access privilege, it can send any of the other

privileged commands to the selected PLC-4 controller. No other

computer can gain access privileges to the same PLC-4 controller until the

privileges of the first computer have been deallocated.

If the 1773-KA module loses power, all access privileges are deallocated.

Format:

(EXT STS Byte Is Optional)

Format When Reporting an Error

TNSSTSCMD

SRCDST

TNSSTSCMD

SRCDST EXT

STS

Format When Successful Execution

Command Format:

TNSSTSCMD

SRCDST FNC

PLC-4

SEL

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 234 235

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario Pagina 117

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