SafetyBUS p is a standard for safe field bus communication within factory automation. It meets SIL level SIL 3 according to IEC 61508 and safety category Cat. 4 of EN 954-1
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SafetyBUS p has been developed during the years 1995 to 1999 by the company Pilz GmbH & Co. KG (Germany). It was the target to enable a field bus for safe communication in terms of safety in machinery. Since 1999 there is an installation basis of approx. 10,000 applications with a total of about 150,000 safe field devices (per 2006).
The technology of SafetyBUS p is has been administered since 1999 by the user organization Safety Network International e.V. (previously SafetyBUS p Club International e.V.). 70 companies world wide have so far joined the user organization (per 2006) and contribute to the SafetyBUS p technology.
The main use of SafetyBUS p is the communication of data with safety relevant content. SafetyBUS p is found where the data integrity and timely delivery of data is required for the protection against risks. In this respect risks may affect life or health, but as well the protection of valuables or machinery.
Typical applications are:
In general all applications with safety requirements up to SIL 3 of IEC 61508 or Cat. 4 of EN 954-1 are possible, as long as the system possesses a safe state (this is not to be mistaken for a high availability system, which typically has no such state, but which is as well classified by SIL levels).
SafetyBUS p is based on the CAN field bus. Besides the OSI layers 1 and 2 defined for CAN, SafetyBUS p adds mechanisms for safety in layers 2 and 7.
For the detection of errors in transmission and within devices, SafetyBUS p uses the following mechanisms:
The key data defined by the technology of SafetyBUS p is as follows:
SafetyBUS p networks only contain safety devices. These devices are typically built using internal redundancy. The use of safety devices for safety applications usually requires the certification of the devices by notified bodies. These certify the devices according to applicable standards and norms. A functional certification is done by the user organization Safety Network International e.V..
The user organization SafetyBUS p Club International e.V. exists since 1999 which is an association of users and manufacturers of SafetyBUS p devices. A national organization for Japan has been founded in 2000 and the US organization followed in 2001. In 2006 the organization changed its name to Safety Network International e.V..
Organizations: