Functions
308
7UM62 Manual
C53000-G1176-C149-3
2.46.4 Recording and Acknowledgement of Commands
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 centre. These messages contain message cause indication. The messag-
es are entered in the event list.
Acknowledgement
of Commands to
the Device Front
All messages which relate to commands that were issued from the device front “Com-
mand Issued = Local” are transformed into a corresponding response and shown in
the display of the device. A list of possible responses and their meanings is given in
the SIPROTEC
®
4 System Manual.
Acknowledgement
of commands to
Local/Remote/Digsi
The messages which relate to commands with the origin “Command Issued = Local/
Remote/DIGSI” must be send independent of the routing (configuration on the serial
digital interface) to the initiating point.
The acknowledgement of commands is therefore not executed by a response indica-
tion as it is done with the local command but by ordinary command and feedback in-
formation recording.
Monitoring of
Feedback
Information
The processing of commands monitors the command execution and timing of feed-
back information for all commands. At the same time the command is sent, the moni-
toring time is started (monitoring of the command execution). 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 commands without process feedback in-
formation, the command output resets.
The “plus” appearing in a feedback information confirms that the command was suc-
cessful, the command was as expected, in other words positive. The “minus” is a neg-
ative confirmation and means that the command was not fulfilled 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 chapter on configuration in the
SIPROTEC
®
4 System Manual.
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