Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 110)

Message Packet Formats
Chapter 5
5-31
7. WORD OFFSET — Contains the word offset between the desired
word and the beginning of the addressed file. The offset is zero for
the first word of a file. In word-range read and write commands, this
field can be combined with a symbolic file address to specify a word
address.
Bit Writes
This is a bit write command to modify the bits at the address specified by
either a word symbol, a file symbol plus a word offset, or a logical
address. This address must point to a word within a file. The function
code is 2. Unlike the current unprotected and protected bit writes in the
basic command set, this command can change the bits in a single word
only.
Command Packet:
TNS DST SRC CMD 00 FNC
0F 02
00 ASCII SYMBOL
(8 CHARS. MAX.) SET
MASK W/F
00
TNS STS CMD
4F
SRC DST
TNS STS CMD
4F
SRC DST EXT
STS
Reply Format: (EXT STS Byte Is Optional)
B. Format When Reporting an Error
A. Format When Successful Execution
B. File Symbol Address Plus Word Offset
A. Word Symbol Address
STS
C. Logical Address
RESET
MASK
TNS DST SRC CMD 00 FNC
0F 02
00 ASCII SYMBOL
(8 CHARS. MAX.) WORD
OFFSET W/F
01 STS SET
MASK RESET
MASK
TNS DST SRC CMD FNC
0F 02
PLC-3 LOGICAL ADDRESS
(2 -51 Bytes) STS SET
MASK RESET
MASK
NOTE:
This is the same as the reply packet
format for all current unprotected,
protected, and privileged bit writes.