GE Multilin 745 Communications Manual page 107

CHAPTER 3: DNP PROTOCOL
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
– The Queue and Clear sub-fields are ignored.
– For point 0, the valid control code values are "Pulse On" (1 hex), "Latch On" (03h), or
"Close - Pulse On" (41h). Any of these may be used to initiate the function (reset)
associated with the point
– Virtual inputs may be set (i.e. asserted) via a Control code value of "Latch On" (3
hex), "Close - Pulse On" (41h), or "Close - Latch On" (43h), A control code value of
"Latch Off" (04h), "Trip Pulse - On" (81h), or "Trip - Latch On" (83h) may be used to
clear a virtual input.
– Any value in the control code field not specified above is invalid and will be
rejected.
3. The On time and Off time fields are ignored. Since all controls take effect immediately
upon receipt, 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.
– If select/operate was used, a status of "Arm Timeout" (1) or "No Select" (2) is
returned if the associated failure condition is detected.
An operate of the reset point may fail to clear active targets (although the response to the
command will always indicate successful operation) due to other inputs or conditions (e.g.
blocks) existing at the time. To verify the success or failure of an operate of this point, it is
necessary to examine the associated binary input(s) after the control attempt is
performed.
When using object 10 to read the status of a binary output, a read of point 0 will always
return zero. For other points, the current state of the corresponding virtual input will be
returned.
Table 3–3: Binary output points
Index Description
0 Reset
1 Virtual Input 1
2 Virtual Input 2
3 Virtual Input 3
4 Virtual Input 4
5 Virtual Input 5
6 Virtual Input 6
7 Virtual Input 7
8 Virtual Input 8
9 Virtual Input 9
10 Virtual Input 10
11 Virtual Input 11
12 Virtual Input 12
13 Virtual Input 13
14 Virtual Input 14
15 Virtual Input 15
16 Virtual Input 16
DNP PROTOCOL
3–5