17.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
IEC 61850 Communication
IEC 61850 Operation
are also mapped to internal commands, read and write actions and MMS infor-
mation report messages. In the case of an unsuccessful control request, the relay
will send the appropriate response PDU indicating that there was a problem and
an MMS information report that contains more detailed information about the
problem that occurred.
When writing controls, the client must select and write the entire Oper, SBOw or
Cancel structure to the relay. See Figure 17.1 for the attributes of the CON Logi-
cal Device and ST and CO functional constraints (FC) of LN RBGGIO1 used for
controls of RB01 through RB08.
Control Error Messages
If a control request results in an error condition, the relay will respond with an
AddCause value in an MMS information report. See Clause 20.5.2.9 of
IEC 61850-7-2 for additional information on the AddCause values.
SEL-400 series relays support the AddCause values in Table 17.4 as part of the
LastApplError information report.
Figure 17.1 MMS Client View of the CON Logical Device
Table 17.4 AddCause Descriptions (Sheet 1 of 2)
AddCause
Enumeration
AddCause
Description
Error Condition
0 Unknown No other AddCause value defined within this
section applies
2 Blocked-by-switch-
ing-hierarchy
Logical node is set to local mode, i.e. Loc.stVal = true
3 Select-failed Originator category not allowed to issue control com-
mands or SelectWithValue operation fails
4 Invalid-position For controls with enhanced security, an AddCause of
“Invalid-position” (4) will be sent if the control status
changes to an unexpected value. If no control status
change is detected after the operate time-out period, an
AddCause of “Time-limit-over” (16) will be sent.
5 Position-reached Control status is already at the desired state
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