2009 until today


FW-5, setIT , FW-5000


IEC 60870-5-101, IEC 60870-5-104

Stadtwerke Marburg GmbH is a 100 % municipal, customer-focussed service provider active in the electricity, gas, heat, water, waste water local transportation and communication services sector in county of Marburg.


In 2008 the Marburg public utility launched the SAE net-line FW-5 telecontrol system for the first time, which was used to monitor a rain spillway basin (RSB). Continuous monitoring at weekends was to be ensured. The GPRS network was chosen as the communication network in order to transmit data securely and encrypted to the BTC control system via a VPN router. The IEC 60870-5-104 protocol was used throughout. In the meantime, almost 40 FW-5 telecontrol stations have been built over the entire urban area. GPRS and FSK systems are preferred for the data communication.

The waste water/water areas are currently equipped with ten stations which are predominately used for monitoring RSBs and pump stations. Another 30 stations have stood the test in the monitoring of 20-kV local network stations; 15 of them are joined with LINAK drives via the Modbus-RTU, thus enabling remote switching of the installations

Compact performance

Stadtwerke Marburg has a compact, powerful telecontrol system in the form of the FW-5, which meets all of the requirements on monitoring, control, logging and transmission. Complex tasks such as command termination with measuring circuit testing or modbus couplings are done securely and reliably by the FW-5. If the application changes, the system can be equipped with up to twelve expansion modules. To enable the user to respond quickly and flexibly to current developments and to implement the requirements in a cost-effective manner.

Easy configurationThe configuration tool setIT is a winner versus the products of other manufacturers due to the its quick and easy configuration which leads to considerably shorter implementation times. The personnel at Stadtwerke Marburg were quick to realise the importance of efficient project implementation. In 2009, they sent two employees to a training seminar in Cologne.

Migration step-by-step

In 2015, Stadtwerke Marburg paved the way for the future investing in a new ring concept based on a network with SHDSL modems and six new net-line FW-5000 gateways. The prerequisite was a step-by-step migration while the old systems continued to run in parallel.

The advantage of this gateway ring architecture was the noticeably quicker data communication to the higher-level BTC control system. The underlying integration of additional BTC work stations via LAN gave staff at the public utility quick access to existing remote terminal units.

Thanks to net-line FW-5000 gateways, modular master stations with TCP/IP networks and individually-equipped interfaces were used, allowing gradual conversion of systems without fuss. In addition, existing copper lines were used to join the master stations in a network which lead to massive cost savings. Using the MiniFlex SHDSL modem, an Ethernet network was built as a ring. Depending on the characteristic curve, it was possible to bypass distances of up to 15 km and attain a throughput of up to 15 Mbit/s. The protocols IEC 60870-5-101/IEC 60870-5-104 were used here by default.

Requirement profile

  • BTC-control system/work station linking
  • Parallel operation during implmentation of new system
  • Compliance with IT security standards (e.g. VPN encryption)
  • Suitable lightning protection
  • Connection of existing telecontrol systems