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RTU expands scope for telecontrol applications

26 June 2017

New Remote Terminal Units (RTU) from Siemens are said to extend the application scope of compact RTUs for telecontrol applications.

The new Simatic RTU3010C, and the functions added to the RTU3030C, can be used for the simple implementation and monitoring of measurement points for process data such as level, flow and fill level, as well as pressure and temperature, even in plants spread over a wide geographical area.

The transmission of process values can be cyclically controlled or event-driven. The RTUs can be connected to any control center using different telecontrol protocols – also standardised protocols. With the support of telecontrol protocols such as Sinaut ST7, the compact RTUs can be integrated into new or existing Sinaut ST7 and SCADA systems. Integrated inputs and outputs allows sensors to be directly connected. Together with web-based engineering, this helps simplify commissioning.

Applications for new RTUs include the water and wastewater industry, agriculture and asset management.To connect to the control center, instead of an integrated UMTS modem the Simatic RTU3010C uses external industrial routers such as Scalance M for network connection over an Industrial Ethernet interface. Power is supplied to both the compact RTUs over a DC12-24 volt interface, by a solar panel with rechargeable battery or simply using conventional batteries.

The RTUs are also capable of powering the connected sensors. The new firmware version 2.0 enables additional batteries to be used, increasing the capacity to more than 70 ampere hours (Ah) and allowing for much longer operating times without the need to change batteries. The RTUs have been designed for use in harsh ambient conditions, at temperatures of between -40°C and +70°C, and when fitted with an additional IP 68 rated protective housing, even in flood conditions.

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