Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual de usuario Pagina 100

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7–13Communication Commands
Publication
17706.5.16 - October 1996
open file
Opens a file in an SLC 500 processor. If the file is successfully
opened, a Tag (low byte, high byte) is returned.
STS
FNC
81
CMD
0F
TNSDST SRC
STS
CMD
4F
SRC DST
Protection
File
number
C
R
File
type
TNS
Tag is used to access the open file using a
protected type file read
or
protected type
file write. Tag is also used to close the file. The T
ag field may be replaced by an
EXT STS field if there is an error
.
Protection -
01h = read
02h = not supported
03h = read/write
Tag
physical read
Uploads data from the PLC data table or program memory.
1774-PLC and PLC-2
C
CMD
04
STS
TNS ADDR SIZE
R
STS
TNS
CMD
44
Data
(max. 244 bytes)
DST SRC
SRC DST
Use the SIZE field to specify the number of bytes to be read. T
o specify a number of
PLC words, SIZE should be an even value because PLC words are two bytes.
PLC-3
For PLC-3 processors, the destination interface module accepts this
command only after the source node has successfully transmitted a
shutdown request.
CMD
0F
STS
FNC
09
TNS
C
CMD
4F
STS
TNS
R
The
EXT STS field may replace the DA
T
A field if there is an error
.
PLC3
phys. address
Size
TNS
Data
(max. 244 bytes
or 122 words)
DST SRC
SRC DST
This command must request an even number of bytes.
SLC 500
SLC 5/03
SLC 5/04
1774PLC
PLC2
PLC3
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