Elektra Elektronik GmbH & Co. Störcontroller KG Hummelbühl 7-7/1 71522 Backnang Germany

Tel.  07191 182-0
Fax 07191 182-200

Opening hours
Mon. - Thu. 8:00 a.m. - 5:00 p.m.
Fri. 8:00 a.m. - 3:00 p.m.

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Tel.  07191 182-0
Fax 07191 182-200

Opening hours
Mon.-Thu. 8:00 a.m. - 5:00 p.m.
Fri. 8:00 a.m. - 3:00 p.m.

Technical Support

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Networkable Fault Annunciator USM

Communication through IEC 60870-5-101/104 and IEC 61850

The networkable annunciators of the series USM provide the functionality and flexibility of the series BSM and add communication interfaces for connection to superior or inferior systems. Through the Modbus protocol information or states can be exchanged and through IEC 60870-5-101/104 and IEC 61850 single and double alarms can be transmitted e.g. to a SCADA system and single and double commands can be received in the opposite direction and issued from the annunciator. In addition, analog inputs enable the monitoring of limit values. In the download area cost-free available EPLAN macros facilitate the creation of circuit diagrams and a smart parameterisation concept ensures that installation and commissioning of the interfaces is easy as never before!

IEC 61850

Communication via IEC 61850 by software license key

By means of a software license key communication over IEC 61850 can be activated for each USM. With the USM acting as "rag-man" single point information as well as double alarms can be integrated easily in existing IEC 61850 structures in switchgear stations. The USM can also be used as a gateway for different protocols, whereby couplings of different protocol types can be displayed simultaneously with the USM, e.g. on the station bus IEC 61850 and on another physical link via IEC 104 objects can be exchanged directly with the control system.

Smart configuration

Integrated Web-Server and parameter import from Excel

The USM can easily be adapted to your application by means of the integrated Web-Server. The parameterisation of the communication interfaces by Drag & Drop as well as parameter import from Excel allow for intuitive and fast configration of the annunciators!

IEC 60870-5-101/-104

Communication to superior or inferior systems

The annunciators of the series USM provide serial as well as network interfaces for communication to superior or inferior systems. The communication can be carried out over the serial interface with the protocol IEC 60870-5-101 or via ethernet with the protocol IEC 60870-5-104.


Links for the protocols IEC 60870-5-101 and -104

Each annunciator of the series USM can maintain up to four links for the protocols IEC 60870-5-101 and -104 respectively at the same time. The communication can be carried out in parallel as well as in redundant groups.


Mirroring of single alarms

In larger plant areas and complex processes, important individual messages from the field are often required at central points or control rooms. In classical systems, 1:1 relays are used, which means a high amount of wiring.
With USM fault reporting systems this effort can be greatly reduced. 32 USM field stations can send and mirror single messages over a network connection (copper or optical fibre) to a central USM or another USM field station. The mirrored messages do not have to be wired individually and acknowledged „at the mirror“, but are always triggered by the state of the triggering USM. Since this is a network-based communication, the USM devices can be located any distance apart.

Analog cards

Threshold monitoring

Analog cards with threshold monitoring. With the new analog cards a maximum of 20 analog values can be processed in one device.
Voltage ranges between 0V and +/- 10V or currents between 0 (4) … 20mA can be applied individually to each input. The highlight is that the values can be provided on on all protocol types i.e. IEC 61850, 60870-5-104 or Modbus, else signaling the under or overrun of a threshold via the digital inputs. Additionally in between or out of range monitoring is provided.
The analog cards can be mixed with other cards such as relay cards. The whole configuration is carried out through the integrated web server, on which as well the physical SI can be shown, e.g. 43,27°C.


USM 2nd Generation

Webinar about fault annunciators

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