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2.21.5
Command Logging
During the processing of the commands, independent of the further message routing and processing,
command and process feedback information are sent to the message processing center. These messages
contain information on the cause. With the corresponding allocation (configuration) these messages are
entered in the event list, thus serving as a report.
Prerequisites
A listing of possible operating messages and their meaning as well as the command types needed for tripping
and closing of the switchgear or for raising and lowering of transformer taps are described in the SIPROTEC 4
System Description.
2.21.5.1 Description
Acknowledgment of Commands to the Device Front
All messages with the source of command LOCAL are transformed into a corresponding response and shown
in the display of the device.
Acknowledgment of commands to Local / Remote / Digsi
The acknowledgment of messages with source of command Local/ Remote/DIGSI are sent back to the initiat-
ing point independent of the routing (configuration on the serial digital interface).
The acknowledgment of commands is therefore not executed by a response indication as it is done with the
local command but by ordinary command and feedback information recording.
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/ .
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Functions
2.21 Command Processing
297
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