Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 178)

Message Formats
Appendix A
AĆ16
B. Format when reporting an error
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC ETX
STS
Where the extended status byte is optional.
Word Range Write
Use this write command with a word symbol, a file symbol plus a word
offset, or a logical address as a starting address. This starting address
must point to a word in a file. This write command can write a block of
data. The function code is 0 (zero). A special case of this command is the
single word write, where the data field is only one word long.
Command Format:
A. Word symbol address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
00
ASCII symbol
(8 characters max)
DLE ETX BCC 00 W/F
00
OFFSET
TOTAL
TRANS
00 DST
ASCII s
(8 characters max)
DATA - Max of 228 bytes
or 114 words
B. File symbol address plus word offset
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
00
ASCII symbol
(8 characters max)
DLE ETX BCC 00
OFFSET
TOTAL
TRANS
00 DST
ASCII
(8 characters max)
DATA - Max of 226 bytes
or 113 words
W/F
01
WORD
OFFSET
C. Logical address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
00
DLE ETX BCC
OFFSET
TOTAL
TRANS
DST
DATA - Max length is 239 bytes minus
PLC-3 logical address
(2-51 bytes)
the length of the PLC-3 logical address
(must be an even number of bytes)