Siemens SIPROTEC 7ST6, Руководство пользователя, Страница: 201 / 356

2.20 Command Processing
201
7ST6 Manual
E50417-G1176-C251-A3
2.20.3 Process Data
During the processing of commands, independently of the further allocation and pro-
cessing of indications, command and process feedbacks are sent to the indication pro-
cessing. These indications contain information on the cause. With the corresponding
allocation (configuration) these indications are entered in the event log, thus serving
as a report.
A listing of possible operational indications and their meaning, as well as the
command types needed for tripping and closing the switchgear or for raising and low-
ering transformer taps and detailed information are described in the SIPROTEC 4
System Description.
2.20.3.1 Method of Operation
Acknowledgement
of Commands to
the Device Front All indications with the source of command LOCAL are transformed into a correspond-
ing response and shown in the display of the device.
Acknowledgement
of commands to lo-
cal/remote/DIGSI The acknowledgement of indications which relate to commands with the origin “Com-
mand Issued = Local/ Remote/DIGSI” are sent back to the initiating point independent
of the routing (configuration on the serial digital interface).
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.
Feedback monitor-
ing Command processing time monitors all commands with feedback. Parallel to the com-
mand, a monitoring time period (command runtime monitoring) is started which
checks whether the switchgear has achieved the desired final state within this period.
The monitoring time is stopped as soon as the feedback information arrives. If no feed-
back information arrives, a response
„Time Limit Expired“
appears and the
process is terminated.
Commands and their feedbacks are also recorded as operational indications. Normal-
ly 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 information, the command output resets.
In the feedback, the plus sign means that a command has been positively completed.
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 out-
put/switching
relays The command types needed for tripping and closing of the switchgear or for raising
and lowering transformer taps have been defined during the configuration, see also
SIPROTEC 4 System Description.
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