A GOOSE frame is not accepted if the Needs Commission bit is set. Data with the Test quality bit set is accepted only if the receiving device is also in the test mode. For more information about GOOSE quality handling, see the corresponding flowcharts.
The Test quality bit is active in the sender if the relay is set to test mode.
When the GOOSE sender is in test mode and the GOOSE receiver is not, the data value is defaulted and the quality is set to invalid.
The GOOSE frame is also not accepted if ConfRev deviates from the one in the configuration. These error situations can be observed in the GSELPRT1 diagnostic counters.
The default GOOSE input value is “0” for all the data types. The functionality is analogous to physically wired galvanic Normally Open (NO) contacts where the disconnected signal gives value “0” of FALSE to relay application. The application must be designed to withstand the default value. This value is used when the subscribed GOOSE data is not valid, or it is not received from the network and the peer device is considered to be in a time-out state.
If a peer device sends the data including the quality attribute at Data Object level, the receiver device input object is not updated according to the received status value if the data quality is bad or questionable. The default value is also used in this case.