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The openSAFETY protocol stack is an implementation of the openSAFETY specification according to IEC 61784-3-13 and is licensed free of charge. The protocol stack was developed by IXXAT together with B&R and is used among others for B&R products, which are already SIL-3 certified. The protocol stack can be downloaded free of charge at Sourceforge.
Hardware concepts for openSAFETY
The Safety Integrity Level (SIL) that can be achieved with the openSAFETY software mainly depends on the hardware architecture used. The openSAFETY software was created for use in SIL-3 devices. To meet the requirements of SIL-1, it is sufficient for example to use one single Safety Controller (SC) that carries out the safe application and the openSAFETY stack. To achieve SIL-3, the Safety Controller must also be designed as redundant.
Overview of functions
With its function modules, the openSAFETY software enables the execution of all communication and back-up mechanisms necessary for openSAFETY. This includes the provision of a Safe Object Directory (SOD), Safe Process Data (SPDO) and Safe Service Data (SSDO) as well as time and CRC monitoring of the data packages.
Zipping and unzipping of the openSAFETY frames in the transmission messages of the non-safe transmission protocol is carried out by the functions of the hardware-level firmware (SHNF) provided by the user. The inputs and outputs of the openSAFETY device must also be controlled by a special safety application. The SOD of the openSAFETY software is used as the data interface to the safety application.
openSAFETY software architecture
Hardware and software development services
As development partner we support you at the implementation and portation of openSAFETY, at the development of safety applications and safety hardware as well as at the certification. At this, you can benefit from our comprehensive openSAFETY know-how and our competence in the development of safety hardware and software.
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