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Safe HMI with PROFINET/PROFIsafe Fieldbus for Use in Trains

The Safe-touch human-machine-interface (Safe HMI) from Deuta-Werke and ABB, is up to SIL 3 (IEC 61508).

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The human-machine interface (HMI) accurately and safely displays either the train’s speed or the status of various safety zones. Fail-safe selections through user touch events and fail-safe graphical objects, like train speed or selected operating modes, can be exchanged between the Safe HMI and the ABB AC500-S safety programmable logic controller (PLC) up to SIL3. Deuta-Werke’s IconTrust technology simultaneously and independently monitors the safety-critical areas on the HMI screen. Should there be a deviation, it triggers a corresponding safety-oriented response. The selected value can be sent through Profinet/Profisafe to the safety PLC for further safety logic processing such as safely changing the operating mode of the application or changing safety process parameters. Each of the individual displayed fail-safe areas is analyzed and compared to the value of the respective input variable during every image refresh cycle of the Safe HMI. SelectTrust technology enables fail-safe selection on the Safe HMI using its touch screen commands. Using SelectTrust technology on Safe HMIs can replace several hard-wired control elements on mechanical control panels. This improves the railway application usability and safety, reduces operating costs and increases application productivity.

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ABB, Inc.

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