Siemens SIPROTEC 7SD80 Manual page 22

Introduction
1.2 Application Scope
Control Functions
The device provides a control function which can be accomplished for activating and deactivating switchgear
via operator buttons, port B, binary inputs and - using a PC and the DIGSI software - via the front interface.
The switch positions are fed back to the device via auxiliary contacts of the circuit breakers and binary inputs.
The current switch positions can be read out at the device and used for plausibility monitoring and interlockings.
The number of the devices to be switched is limited by the binary inputs and outputs available in the device or
the binary inputs and outputs allocated for the switch position feedbacks. Depending on the equipment, one
binary input (single point indication) or two binary inputs (double point indication) can be used. The release to
switch can be restricted by appropriate settings for the switching authority (remote or local), and by the oper-
ating mode (interlocked/non-interlocked, with or without password validation). Interlocking conditions for
switching (e.g. switchgear interlocking) can be defined with the help of integrated user-configurable logic func-
tions.
Messages and Measured Values; Recording of Event and Fault Data
The operational indications provide information about conditions in the power system and the device. Measure-
ment quantities and values that are calculated can be displayed locally and communicated via the serial inter-
faces.
Device messages can be assigned to a number of LEDs on the front cover (allocatable), can be externally pro-
cessed via output contacts (allocatable), linked with user-definable logic functions and/or issued via serial in-
terfaces.
During a fault (system fault) important events and changes in conditions are saved in fault protocols (Event Log
or Trip Log). Instantaneous fault values are also saved in the device and may be analyzed subsequently.
Communication
The following interfaces are available for communication with external operating, control and memory systems.
The USB DIGSI interface on the front cover serves for local communication with a PC. With the SIPROTEC 4
operating software DIGSI, all operation and evaluation tasks can be executed using this operator interface, for
instance specifying and editing configuration parameters and settings, configuring user-specific logic functions,
retrieving operational messages and measured values, inquiring device conditions and measured values,
issuing control commands.
Port A is located on the bottom side of the device. This protection data interface connects the device to its
partner device at the remote end of the protected object.
Alternatively, you can implement the communication link using the voltage terminals D-1 and D-2.
Port B serves for central communication between the device and a control center. It can be operated via data
lines or optical fiber cables. For the data transfer, standardized protocols according IEC 60870-5-103 are avail-
able. The integration of the devices into the SINAUT LSA and SICAM automation systems can also be imple-
mented with this profile.
Alternatively, there are additional connection options available in connection with PROFIBUS DP and the
DNP3.0 and MODBUS protocols. If an EN100 module is available, it is also possible to use the IEC61850 pro-
tocol.
You can also use port B to connect a time synchronization device such as DCF77 or IRIG-B.
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SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011