GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 235

7 COMMUNICATIONS
POINT LIST FOR:BINARY OUTPUT (OBJECT 10)
CONTROL RELAY OUTPUT BLOCK (OBJECT 12)
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
The following restrictions should be observed when using object 12 to control the points listed in the above 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:
• The Queue and Clear sub-fields are ignored.
• For point 0, the valid Control Code values are "Pulse On" (1 hex), "Latch On" (3 hex), or "Close - Pulse On" (41 hex).
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" (41 hex), or
"Close - Latch On" (43 hex), A Control Code value of "Latch Off" (4 hex), "Trip Pulse - On" (81 hex), or "Trip - Latch On"
(83 hex) 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 irrele-
vant.
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 incor-
rectly formatted.
• If select/operate was used, a status of "Arm Timeout" (1) or "No Select" (2) is returned if the associated failure condi-
tion 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.
GE Multilin
Courtesy of NationalSwitchgear.com
745 Transformer Management Relay
7.5 DNP COMMUNICATIONS
7-65
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