Siemens SIPROTEC 6MU805 User Manual page 64

Functions
2.4 Command Processing
Monitoring of Feedback Information
The processing of commands monitors the command execution and timing of feedback information for all com-
mands. At the same time the command is sent, the monitoring time is started (monitoring of the command ex-
ecution). This time controls whether the device achieves the required final result within the monitoring time. The
monitoring time is stopped as soon as the feedback information arrives. If no feedback information arrives, a
response "Timeout command monitoring time" appears and the process is terminated.
Commands and information feedback are also recorded in the event list. Normally the execution of a command
is terminated as soon as the feedback information (FB+) of the relevant switchgear arrives or, in case of com-
mands without process feedback information, the command output resets and a message is output.
The "plus" sign appearing in a feedback information confirms that the command was successful. The command
was as expected, in other words positive. The "minus" is a negative confirmation and means that the command
was not executed as expected.
Command Output and Switching Relays
The command types needed for tripping and closing of the switchgear or for raising and lowering of transformer
taps are described in the configuration section of the SIPROTEC 4 System Description /1/ .
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SIPROTEC, 6MU805, Manual
C53000-G1140-C380-5, Release date 06.2018