Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Bedienungsanleitung Seite 84

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Seitenansicht 83
6–5Application Layer Message Packets
Publication
17706.5.16 - October 1996
CMD and FNC
These bytes work together to define the activity that is to be
performed by the command message at the destination node.
Values for these bytes are supplied by the application layer.
The message format depends on the CMD and FNC values.
command message = 0
reply message = 1
0
Command
or Reply
Priority
Bit: 7 6 5 4 3 2 1 0
0
Command
always = 0 always = 0
normal priority = 0
high priority= 1
CMD byte
command code
High
priority only applies to DH links. It does not apply to DH+, DH485, or DHII links.
This byte Defines the And has these values
CMD
(command)
command type
see table that begins on
FNC
(function)
specific function under that command type
see
table
that
begins
on
page 7-2
Example
code
PLC2 command  e
nter download mode
send =
000001
1
1
(07 hex)
reply =
01000111 (
47 hex)
highpriority send (DH only) =
0010011
1
27
hex
highpriority
reply (DH only) =
0110011
1
(67 hex)
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