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489
Communications Guide
http://www.GEindustrial.com/multilin
51
GE Multilin
Binary / Control Relay
Output Block (Objects
10/12)
The following restrictions should be noted when using object 12 to control the points
listed above:
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.
–If the Control Code field is zero (i.e., NUL operation) the command is
accepted but no action is taken.
– For all points, the only valid control is “Close - Pulse On” (41 hex). This is
used to initiate the function (e.g., Reset) associated with the point.
– Any value in the Control Code field not specified above is invalid and will
be rejected.
–The On Time and Off Time fields are ignored. A ”Pulse On” control takes
effect immediately when received. Thus, the timing is irrelevant.
–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 point and the relay, owing
to its configuration, does not allow the point to perform its function.
An operate of the Reset point 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 this point 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 any Binary Output, a value of zero will
always be returned. This is due to the fact that all points are “Pulse On” and are
deemed to be normally off.
Table 6: Binary Output Point List
INDEX DESCRIPTION
0 Reset
1 Generator Start
2 Generator Stop
3 Clear Trip Counters
4 Clear Last Trip Data
5 Clear MWh and Mvarh
6 Clear Peak Demand Data
7 Clear Generator Information
8 Clear Breaker Information