H.20
SEL-351A Relay Instruction Manual Date Code 20080213
Distributed Network Protocol
Point Remapping
Point Remapping
The analog and binary input points (objects 1, 2, 30, and 32) may be remapped
via the DNP command. The map is composed of 2 lists of indices, one for the
analogs (30 and 32) and the other for the binaries (1 and 2). The indices
correspond to those given by the relay’s default DNP data map. The order they
occur in the list determines the index that the corresponding value is reported
as to the DNP master. If a value is not in the list, it is not available to the DNP
master. All 1025 binaries and 114 analogs may be included in the list, but may
occur only once. The maps are stored in nonvolatile memory. The DNP
command is only available if DNP has been selected on one of the ports. The
DNP command has the following format:
DNP [type]
where type may be A, B, S, T, or omitted.
If the DNP command is issued without parameters, the relay displays both the
analog and binary maps, which have the following format:
==>DNP <STX>
Analogs =112 28 17 35 1 56 57 58 59 60 61 62 63 64 65 \
66 67 100 101 102 103
Binaries =Default Map<ETX>
==>
If the DNP command is issued with an S parameter, the relay displays only the
analog map; likewise, a T causes the relay to display only the binary map. If
the map checksum is determined to be invalid, the map will be reported as
corrupted during a display command, as follows:
==>DNP T <STX>
Binaries = Map Corrupted<ETX>
==>
If the map is determined to be corrupted, DNP will respond to all master data
requests with an unknown point error. If the DNP command is issued with an
A or B parameter at level 2 or greater, the relay requests the user enter indices
for the corresponding list, where a parameter of A specifies the Analog list
and B specifies the Binary list. The relay accepts lines of indices until a line
without a final continuation character (\) is entered. Each line of input is
constrained to 80 characters, but all the points may be remapped, using
multiple lines with continuation characters (\) at the end of the intermediate
lines. If a single blank line is entered as the first line, the remapping is
disabled for that type (i.e., the relay uses the default analog or binary map).
For example, the first example remap could be produced with the following
commands:
==>DNP A <Enter>
Enter the new DNP Analog map
112 28 17 \<CR>
35 1 56 57 58 59 60 61 62 63 64 65 66 67 100 101 102 \<CR>
103<CR>
==>DNP B <Enter>
Enter the new DNP Binary map
<CR>
==>
Courtesy of NationalSwitchgear.com
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