n the context of industrial applications at high-risk where, according to the European Machinery Directive, high levels of SIL (Safety Integrity Level) or PL (Performance Level) ratings are required, security will be ensured by an independent device for safety control. The critical point for the performance of this device rests with its resistance to faulty conditions. This resistance depends not only on the quality and reliability of its components, but also, primarily, on the device’s structure (or architecture).
These safety devices are designed primarily using the well-known architecture of signal measurement / logic control / actuator). High levels of SIL or PL can only be achieved by using redundancy to duplicate critical components.
Due to its double bridge sensor, the SENSY technology can provide the security control’s logic device with the required redundancy signal. The monitoring and comparison of these redundant signals, performed by the control logic (safety PLC; "fail-safe" configurable control systems) provide the means to prevent, detect, or tolerate faulty conditions. In this case, a failure of the measuring signal is detected and treated before the next request for the safety function.