SafetyBUS p is a standard for failsafe fieldbus communication in automation technology. It meets SIL 3 of IEC 61508 and Category 4 of EN 954-1 or Performance Level "e" of the successor standard EN 13849-1.
SafetyBUS p was developed by Pilz GmbH & Co. KG between 1995 and 1999. The objective was to provide a fieldbus for data communication in terms of machinery safety .
Since 1999 the technology of SafetyBUS p has been managed by the user organisation Safety Network International e.V. (formally SafetyBUS p Club International e.V.), whose members work on the further development of SafetyBUS p.
The main application of SafetyBUS p lies in the communication of data with safety-related content. SafetyBUS p can be used anywhere that communicated data has to be consistent in terms of time and content, in order to safeguard against danger. This danger may concern hazards to life and limb, but may also involve the protection of economic assets.
Typical application areas are:
SafetyBUS p can be used on applications with safety-related requirements up to SIL 3 of IEC 61508 or Cat. 4 of EN 954-1.
Technically, SafetyBUS p is based on the fieldbus system CAN. In addition to OSI Layers 1 and 2, which are already defined in CAN for bit rate and security, SafetyBUS p adds additional mechanisms to safeguard transmission in Layers 2 and 7.
The following mechanisms are used on SafetyBUS p to detect transmission errors and device errors:
The SafetyBUS p frame data, as determined by the technology, is as follows:
Only safety-related devices are used in SafetyBUS p networks. In general these are designed to be multi-channel internally. Safety-related use of the devices normally requires safety to be certified by authorised testing laboratories, who test the devices in accordance with the applicable standards and provisions. A functional inspection is carried out by the user organisation Safety Network International e.V.
The user organisation SafetyBUS p Club International e.V. combines manufacturers and users of SafetyBUS p and has been in existence since 1999. In 2006 the organisation was renamed Safety Network International e.V. In addition to the international organisation there are also two other regional organisations: Japan was established in 2000, while USA was established in 2001. The organisation continues to develop the system, resulting in its successor, SafetyNET p.