Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 115)

Message Packet Formats

Chapter 5

5-36

Word Range Read

This is a read command whose starting address is either a word symbol, a

file symbol plus a word offset, or a block address. This starting address

must point to a word in a file. The function code is 1. A special case of

this command is the single-word read, where the number of bytes to read

is only two bytes (one word).

TNSDST SRC CMD 00 00FNC

0F 01

PACKET

OFFSET

TOTAL

TRANS

ASCII SYMBOL

(8 CHARS. MAX.)

W/F

TNSDST SRC CMD FNC

0F 01

PACKET

OFFSET

TOTAL

TRANS

PLC- 3 LOGICAL

ADDRESS

(2-51 Bytes)

SIZESTS

TNSSTSCMD

SRCDST

TNSSTSCMD

SRCDST EXT

STS

DATA

— Max. of 244 Bytes

or 122 W

ords

Command

Format:

Reply Format:

(EXT STS Byte Is Optional)

Format When Reporting an Error

Format When Successful Execution

Logical Address

A. W

ord Symbol Address

SIZE

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 234 235

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