Siemens siprotec 7SA522 User Manual page 123

Configuring a LED
Display as a Desti-
nation
Configuring an
Indication Buffer
as a Destination
7SA522 Manual
C53000-G1176-C119-2
Figure 5-24 Dialogue box: object properties for a command with feedback
The conditional checks that should be conducted before execution of a switching com-
mand can also be defined:
• Device position (scheduled/actual): The switching command is ignored and a cor-
responding indication is issued if the switching device is already in the intended po-
sition. If this check is activated, switching direction control occurs not only for inter-
locked, but also for non-interlocked switching.
• Zone controlled (Bay Specific Interlocking): Logic functions created with CFC in the
relay are processed for interlocked switching.
• Blocked by protection: CLOSE commands to the switchgear are blocked as soon
as one of the protective functions or elements in the relay picks up. OPEN com-
mands, in contrast, can always be executed.
• Double operation: Parallel switching operations are blocked with respect to each
other: while one switching operation is being conducted, a second one cannot be
performed.
• Switching Authority – Local Commands: A local control switching command is only
allowed if local control is enabled on the relay (via lockswitch or setting).
• Switching Authority – Remote Commands: A remote control switching command is
only allowed if remote control is enabled on the relay (via lockswitch or setting).
Single point indications (SP), output indications (OUT), and internal single point indi-
cations (IntSP) may be assigned to LEDs. When this is done, you may select whether
the indications are to be latched (/) or unlatched (8).
Up to ten (10) indications may be assigned to a LED display. One indication may be
assigned to a maximum of ten (10) outputs (LEDs and output relays).
Dependent on the type and version of a relay, a maximum of three indication buffers
may be available for messages: Operation (Event Log) Buffer (2), and Fault (Trip Log)
Buffer (7). The indications from protective functions are firmly assigned to these indi-
cation buffers. For the others, Table 5-2 provides an overview of which indication type
may be configured to which buffer.
Configuration
5-25