7.34
SEL-751 Relay Instruction Manual Date Code 20170927
Communications
Communications Protocols
Code
When appropriate, this text field contains warning or error condition text that is abbreviated as
follows:
Transmit Data Set
Reference
This field represents the DataSetReference (Data Set Reference) that includes the IED name,
LN0 lnClass (Logical Node Class), and GSEControl datSet (Data Set Name)
(e.g., SEL_351S_1CFG/LLN0$DSet13).
Receive Data Set
Reference
This field represents the datSetRef (Data Set Reference) that includes the iedName (IED name),
ldInst (Logical Device Instance), LN0 lnClass (Logical Node Class), and datSet (Data Set
Name) (e.g., SEL_351S_1CFG/LLN0$DSet13).
Ctrl Ref/
ControlBlockReference
This is the GOOSE control block reference. It is a concatenation of the logical device name,
LLN0 (logical node containing the control block), GO (functional constraint), and the GSECon-
trol name. (e.g. SEL_351S_1CFG/LLN0$GO$GooseDSet13)
AppID
This is the application identifier as a decimal number.
From
This is the date and time the current statistics collection started.
To
This is the date and time the GOOSE statistics command was executed.
Accumulated downtime
duration
This represents the total amount of time a subscription was in an error state. The duration is dis-
played in the format: hhhh:mm:ss.zzz.
Maximum downtime duration
This represents the maximum amount of time a subscription was continuously in error state.
The duration is displayed in the format: hhhh:mm:ss.zzz.
Date & time maximum down-
time began
This is the date and time the recorded maximum downtime started.
Number of messages
received out-of-sequence
(OOS)
This represents the total number of messages received with either the state number and/or
sequence number out-of-sequence. This includes cases where more than one instance of a mes-
sage is received within a single relay processing interval. In this case, the most recent message
is processed and the others are discarded.
Number of time-to-live
(TTL)
violations detected
This represents the total number of times a message was not received within the expected
period/interval.
Number of messages incor-
rectly encoded or cor-
rupted
This represents the total number of messages that were identified with this subscription but
were either incorrectly encoded or encoded with a wrong dataset.
Number of messages lost
due to receive overflow
This represents the total number of messages that were not processed because memory
resources were exhausted. This includes cases where more than one instance of a message is
received within a single relay processing interval. In this case, the most recent message is pro-
cessed and the others are discarded.
Calculated max. sequen-
tial messages lost due to
OOS
This represents the maximum estimated number of messages that were missed after receiving a
message with a higher state or sequence number than expected.
Calculated number of mes-
sages lost due to OOS
This represents the total of all estimated number of messages lost due to state or sequence num-
ber skip in received messages.
Information Field Description
Code Abbreviation Explanation
OUT OF SEQUENC Out of sequence error
CONF REV MISMA Configuration Revision mismatch
NEED COMMISSIO Needs Commissioning
TEST MODE Test Mode
MSG CORRUPTED Message Corrupted
TTL EXPIRED Time to live expired
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