SafetyBUS p

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SafetyBUS p is a standard for fail-safe fieldbus communication in automation technology . It fulfills SIL  3 of IEC 61508 as well as safety category Cat. 4 of EN 954-1 and Performance Level "e" (Cat.4) of the successor standard EN ISO 13849 .

Emergence

SafetyBUS p was developed between 1995 and 1999 by Pilz GmbH & Co. KG . The aim was to provide a fieldbus for the communication of data in terms of machine safety.

Since 1999, the SafetyBUS p technology has been administered by the user organization Safety Network International eV (previously SafetyBUS p Club International eV ), in which the members are working on the further development of SafetyBUS p.

commitment

The main use of SafetyBUS p is to communicate data with safety-relevant content. SafetyBUS p is used wherever the time and content consistency of communicated data is required to protect against hazards. The dangers can be a threat to life and limb, but also the protection of assets.

Typical areas of application are:

  • Factory automation (e.g. automobile production, presses)
  • Transport technology (e.g. cable cars, rides)

SafetyBUS p can be used for applications with safety requirements up to SIL 3 of IEC 61508 or Cat. 4 of EN ISO 13849-1 .

technology

SafetyBUS p is technologically based on the CAN fieldbus system . In addition to the OSI layers 1 and 2 already defined in CAN for bit transmission and security, SafetyBUS p also has additional mechanisms for securing transmission in layers 2 and 7.

Failure mechanisms

The following mechanisms are used with SafetyBUS p to detect transmission and device errors:

  • Consecutive numbers
  • Time expectation
  • echo
  • Identifier for sender and receiver
  • Data backup (CRC)

Technical specifications

The framework data of SafetyBUS p determined by the technology are as follows:

  • A maximum of 64 bus participants per network
  • Up to 4000 I / O points per network
  • Transmission rates 20 to 500 kbaud, depending on the network expansion
  • Individual network segments can extend up to 3500 m.
  • Several network segments can be linked
  • Guaranteed error response times of up to 20 ms can be achieved
  • Suitable for applications according to SIL 3 of IEC 61508 and Cat. 4 of EN ISO 13849
  • Optional power supply for the devices via the bus cable
  • Partial networks can be implemented using radio technology, fiber optic cables and infrared connections.

equipment

Safety-related devices are used exclusively in SafetyBUS p networks. These are usually built internally with multiple channels. The safety-related use of the devices normally requires certification of safety by authorized test laboratories. They check the devices in accordance with the applicable standards and regulations. A functional test is carried out by the user organization Safety Network International eV

organization

The user organization Safety Bus p Club International eV , in which manufacturers and users of SafetyBUS p have come together, has existed since 1999 . The organization was renamed Safety Network International eV in 2006. In addition to the international organization, there are two other regional organizations: Japan, founded in 2000, and the USA, founded in 2001. The organization continues to develop the system, so SafetyNET p could be made available as a successor.

literature