Word range write (write block), Write bytes physical (physical write) – Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command User Manual
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Communication Commands
Publication 1770Ć6.5.16 - October 1996
word range write (write block)
Writes to a word or file starting at a specified address. A special
case of this command is the single-word write, where the data field is
only one word long.
CMD
0F
STS
FNC
00
TNS
C
CMD
4F
STS
R
DST SRC
SRC DST
Packet
Offset
PLC system address
Total
Trans
Data (max. 240 bytes -
the PLC address field)
TNS
EXT
STS
The EXT STS field may be attached to the reply packet only when there is an error.
For this processor
The starting address can be a
PLCĆ3
word symbol, file symbol plus a word offset, or a block address.
The starting address must point to a word in a file.
PLCĆ5
logical binary address or a logical ASCII address of up to 51
bytes.
write bytes physical (physical write)
Performs a download only after receiving a reply that the download
(or upload) all request has been successfully performed.
CMD
0F
STS
FNC
18
TNS
C
CMD
4F
STS
TNS
R
DST SRC
SRC DST
EXT
STS
PLCĆ5 phys. address
A
PLCĆ5 physical address - contains the address you are writing to.
A - Up to 238 bytes can be written with a single command (low byte of the word first).
(Must be an even number of data bytes.)
The EXT STS field may be attached to the reply packet only when there is an error.
•
PLCĆ3
•
PLCĆ5
•
PLCĆ5
•
PLCĆ5/VME