Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Manual de usuario descargar pdf (Pagina 100)

Message Packet Formats

Chapter 5

5-21

Note that the interface module at the receiving PC station executes this

command by first making a copy of the addressed PC byte. It then sets or

resets the appropriate bits and writes the byte back into PC memory. At

the same time, the PC processor can be changing the states of the original

bits in memory. Because of this, some data bits may unintentionally be

overwritten.

Command

Format:

Reply Format:

TNSSTSCMD

05

SRCDST

TNSSTSCMD

45

SRCDST

ADDR

Up to 60 Masks of

This Form

SET RESET

Unprotected Read

This command reads words of data from any 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

01

SRCDST

TNSSTSCMD

41

SRCDST

ADDR

DATA

— Max. of 244 Bytes

SIZE

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 234 235

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