Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual User 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
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