GE 750, Инструкция по эксплуатации

Страница: 399 / 504

GE Power Management 750/760 Feeder Management Relay 16-
91
16 COMMUNICATIONS 16.5 DNP 3.0 DEVICE PROFILE
16
• A Code sub-field of “Latch On” (3) or “Latch Off” (4) is valid for all virtual input points (i.e., points 3
through 22). This is used to set the associated Virtual Input on (“Latch On”) or off (“Latch Off”). As
well, a “Close” value in the Control Code field will cause the virtual input to be turned on while a
“Trip” value in this field will cause the virtual input to be turned off.
• The “Breaker Control” point (23) will only accept a “Trip” or “Close” value. A value of “Trip” will acti-
vate the “Breaker Open” function. Similarly, a value of “Close” will activate the “Breaker Close”
function.
• All operations not defined above are invalid and will be rejected.
3. The On Time and Off Time fields are ignored. A ”Pulse On” Code takes effect immediately when received,
therefore 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 if an attempt was
made to operate the “Open Breaker” (1), “Close Breaker” (2) or “Breaker Control” (23) points and
the relay is in local mode (this status is indicated by Object 1, Point 14).
Setting or clearing a Virtual Input will always succeed, however an operate of the Reset, Open Breaker, Close
Breaker or Breaker Control points may fail (even if the command is accepted) due to other inputs or conditions
(e.g., blocks) 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.
When using object 10 to read the status of a Binary Output, a read of points 0 through 2 and 23 will always
return zero. For other points, the current state of the corresponding Virtual Input will be returned.