Command Logging; Functional Description - Siemens SIPROTEC 4 7SD80 Manual

Functions
2.18 Breaker Control
•
REMOTE and DIGSI
– Commands issued by SICAM or DIGSI are unlocked via a global switching mode REMOTE. A separate
request must be sent for the unlocking. The unlocking applies only for one switching operation and
for commands caused by the same source.
– Job order: command to object "Switching mode REMOTE", ON
– Job order: switching command to "switching device"
•
Command via CFC (automatic command, SC=Auto SICAM):
– Behavior configured in the CFC block ("BOOL to command").

Command Logging

2.18.5
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.
2.18.5.1

Functional 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 initiating
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
commands. At the same time the command is sent, the monitoring 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 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 trans-
former taps are described in the configuration section of the SIPROTEC 4 System Description
System Description.
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SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018