Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 101)

Message Packet Formats

Chapter 5

5-22

Unprotected Write

This command writes words of data into ay 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:

Reply Format:

TNSSTSCMD

SRCDST

TNSSTSCMD

SRCDST

ADDR DATA

— Max of 242 Bytes

PLC Commands

PLC stations can execute all of the commands in the basic command set,

except the commands to set NAKs, ENQs, timeouts, and variables. They

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

controllers:

Disable Outputs

Enable Program

Enable Scan

Physical Read

Physical Write

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

can initiate them. Their primary purpose is for uploading and

downloading PLC memory.

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Strona 101