P16800: SIL 4-compliant speed signal doubling
Simplifies retrofitting and reduces costs for new rail vehicles
Numerous systems in and on rolling stock depend on information about the current speed. This especially includes braking and train command systems, which are subject to the highest standards of functional safety. Encoders and sensors used to supply speed data must therefore operate reliably and precisely. If additional applications also require data on speed, additional rotary encoders are typically mounted to the axles of the units. However, space is often limited. Moreover, installation, wiring, and the associated approvals cost time and money. With its P16800 series, Knick offers a unique, patented solution for non-interacting decoupling of signals from existing rotary encoders, making them available to other controllers.
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What sets the P16800 series apart?
Retrofitting of the train control system (ETCS, PTC, CBTC, etc.) without additional sensors
The P16800 decouples signals from one- or two-channel speed sensors in a non-interacting manner, in accordance with EN 50129 (SIL 4). The decoupled signals are made available at the outputs of the P16800 with unchanged frequency and phase angle so that the speed signal transducer behaves like a rotary encoder from the perspective of the downstream controller. The rotary encoder signals are transmitted with galvanic isolation and functional safety in accordance with EN 50129 (SIL 2), as needed. As with the rotary encoders, the P16800 is powered by the connected controller. To improve compatibility between rotary encoders and new controllers, the device can convert rotary encoder signals from current signals into voltage signals or vice versa.
Optionally, the output frequency can be reduced relative to the input at a ratio of 2:1, 4:1, or 8:1. Using the P16800 efficiently solves the problem of limited installation space for additional rotary encoders at axle ends. At the same time, it makes the complex retrofitting of railway traction vehicles within the context of modern train control systems such as ETCS, PTC, or CBTC much easier. Compared to conventional solutions, such as replacing rotary encoders with multi-channel versions, the P16800 stands out thanks to a lower approval effort, reduction in system complexity, and significant cost savings.
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Significant savings for new rail vehicles—without compromising safety
Using the P16800 offers manufacturers substantial potential for cost savings when developing new rolling stock, as the number of speed sensors required in new rail vehicles can be decreased thanks to non-interacting signal doubling according to SIL 4.
Furthermore, the series has impressive flexibility: It reliably reads signals from all conventional rotary encoders—without the need for software customization. Moreover, the P16800 meets the highest safety requirements and can be easily integrated into existing wiring concepts and shield designs. This has a positive effect on development time and approval processes.
To sum it up, the signal doubler clearly pays off, especially in economic terms: Fewer sensors mean reduced effort for installation and maintenance—a clear benefit over the entire life cycle of the rolling stock.
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