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The analog input quantities are passed on to the input amplifiers (IA). The input amplifier IA element provides
a high-resistance termination for the input quantities. It consists of filters that are optimized for measured-value
processing with regard to bandwidth and processing speed.
The analog-to-digital (AD) transformer group consists of an analog-to-digital converter and memory compo-
nents for the transmission of data to the microcomputer.
Microcomputer System
Apart from processing the measured values, the microcomputer system (μC) also executes the actual protec-
tion and control functions. They especially include:
• Filtering and preparation of the measured quantities
• Continuous monitoring of the measured quantities
• Monitoring of the pickup conditions for the individual protective functions
• Interrogation of limit values and sequences in time
• Control of signals for the logic functions
• Output of control commands for switching devices
• Recording of messages, fault data and fault values for analysis
• Management of the operating system and the associated functions such as data recording, real-time clock,
communication, interfaces, etc.
• The information is distributed via output amplifiers (OA).
Binary Inputs and Outputs
The computer system obtains external information through the binary input/output boards (inputs and outputs).
The computer system obtains information from the system (e.g remote resetting) or from external equipment
(e.g. blocking commands). These outputs include, in particular, trip commands to circuit breakers and signals
for the remote indication of important events and conditions.
Front Elements
Information such as messages related to events, states, measured values and the functional status of the
device are visualized by light-emitting diodes (LEDs) and a display screen (LCD) on the front panel.
Integrated control and numeric keys in conjunction with the LCD enable interaction with the remote device.
These elements can be used to access the device for information such as configuration and setting parameters.
Similarly, setting parameters can be accessed and changed if needed.
In addition, control of circuit breakers and other equipment is possible from the front panel of the device.
Interfaces
Communication with a PC can be implemented via the USB DIGSI interface using the DIGSI software, allow-
ing all device functions to be easily executed.
Communication with a PC is also possible via port A (Ethernet interface) and port B (System/Service interface)
using DIGSI.
Port A or port B can be used for connecting a thermobox - via Ethernet - to enter external temperatures (e.g.
overload protection). Optionally, up to 5 temperature sensors can be connected directly to the device via the
I/O 2 extension module.
In addition to the device communication via DIGSI, port B can also be used to transmit all device data to a
central evaluator or a control center. This interface may be provided with various protocols and physical trans-
mission schemes to suit the particular application.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Introduction
1.1 Overall Operation
19
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