Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 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).
TNS DST SRC CMD 00 00 FNC
0F 01
PACKET
OFFSET TOTAL
TRANS ASCII SYMBOL
(8 CHARS. MAX.) W/F
00
TNS DST SRC CMD FNC
0F 01
PACKET
OFFSET TOTAL
TRANS PLC- 3 LOGICAL ADDRESS
(2-51 Bytes) SIZE STS
TNS STS CMD
4F
SRC DST
TNS STS CMD
4F
SRC DST EXT
STS
STS
DATA — Max. of 244 Bytes
or 122 Words
Command Format:
Reply Format: (EXT STS Byte Is Optional)
B. Format When Reporting an Error
A. Format When Successful Execution
B. Logical Address
A. Word Symbol Address
SIZE