Level of Implementation
DNP has three subset levels, each of which includes a specific subset of DNP message
types and functionality. In COM 600 the DNP protocol has been implemented according
to the Subset Level 2 of the protocol as presented in Table 2.2-1.
Table 2.2-1 Data object types and variations supported
Qualifier
code of
Response
message
Function
code of
Response
message
Qualifier
code of
Request
message
Function
code of
Request
message
DescriptionVariationData object
type
61Binary input,
all variations
01
0,1129,130Binary input11
0,1129,130Binary input
with status
21
6,7,81Binary input
change, all
variations
02
17,28129,1306,7,81Binary input
change
without time
12
17,28129,1306,7,81Binary input
change with
time
22
17,28129,1306,7,81Binary input
change with
relative time
32
61Binary out-
put, all vari-
ations
010
0,1129,130Binary out-
put status
110
echo12917,283,4,5,6Control
relay output
block
112
17,281,7,8,9,10Binary
counter, all
variations
020
0,1129,13032-bit binary
counter
120
0,1129,13016-bit binary
counter
220
0,1129,13032-bit delta
counter
320
14
1MRS756566
COM600 Station Automation Series
DNP 3.0
LAN/WAN Master
(OPC) 3.2
User's Guide