8–10
PQM POWER QUALITY METER – INSTRUCTION MANUAL
DNP 3.0 PROTOCOL
CHAPTER 8: DNP COMMUNICATIONS
The following restrictions should be observed when using object 12 to control the points
listed in the following table.
1.
The
Count
field is checked first. If it is zero, the command will be accepted but no
action will be taken. If this field is non-zero, the command will be executed exactly
once regardless of its value.
2.
The
Control Code
field of object 12 is then inspected:
• A NUL Code will cause the command to be accepted without any action being
taken.
• A Code of “Pulse On” (1) is valid for all points. This is used to activate the function
(e.g., Reset) associated with the point.
• All other Codes are invalid and will be rejected.
• The Queue, Clear, and Trip/Close sub-fields are ignored.
3.
The
On Time
and
Off Time
fields are ignored. A “Pulse On” Code takes effect immedi-
ately when received. Thus, the timing is irrelevant.
4.
The
Status
field in the response will reflect the success or failure of the control
attempt thus:
• A Status of “Request Accepted” (0) will be returned if the command was accepted.
• A Status of “Request not Accepted due to Formatting Errors” (3) will be returned if
the
Control Code
field was incorrectly formatted or an invalid Code was present in
the command.
• A Status of “Control Operation not Supported for this Point” (4) will be returned in
response to a “Latch On” or “Latch Off” command
5.
An operate of the Reset, alarm relay on/off or Aux Relay 1-3 on/off points may fail
(even if the command is accepted) due to other inputs or conditions (e.g., alarm condi-
tions) existing at the time. To verify the success or failure of an operate of these points
it is necessary that the associated Binary Input(s) be examined after the control
attempt is performed.
6.
When using object 10 to read the status of a Binary Output, a read will always return
zero.
Simulate “RESET” keypress
Simulate “STORE” keypress
Simulate “MESSAGE UP” keypress
Simulate “MESSAGE DOWN” keypress
Simulate “MESSAGE LEFT” keypress
Simulate “MESSAGE RIGHT” keypress
Simulate “VALUE UP” keypress
Simulate “VALUE DOWN” keypress
* These points are not supported in binary output
Table 8–3: Point List for Binary Output (Object 10)
Control Relay Output Block (Object 12)
INDEX
DESCRIPTION
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