Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 181)

Message Formats
Appendix A
AĆ19
File Write
Use this write command with either a file symbol or a block address as a
starting address. This starting address points to a file of words. This
write command can write a block of data. You must read the entire file.
The file size must equal the exact size of the file or an error will be
returned. The function code is 3.
Command Packet Format:
A. File symbol address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
03 OFFSET
TOTAL
TRANS
00 DST
ASCII symbol
(8 characters max)
00 ASCII s
(8 characters max)
DLE ETX BCC DATA - Max of 244 bytes or 114 words
B. Logical address
DLE SRC C
0
S TNS MD
F
TS TNS STX FNC PACKET
03
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)
Reply Format:
This is the same as the reply packet format for all writes.
A. Format when the command was successfully executed
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC
B. Format when reporting an error
DLE SRC STX DST C
4F
S TNS
MD TS TNS DLE ETX BCC ETX
STS