SafetyBUS p
Encyclopedia
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
(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.
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).
field bus. Besides the OSI
layers 1 and 2 defined for CAN, SafetyBUS p adds mechanisms for safety in layers 2 and 7.
.
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.
.
Fieldbus
Fieldbus is the name of a family of industrial computer network protocols used for real-time distributed control, now standardized as IEC 61158....
communication within factory automation. It meets SIL
Safety Integrity Level
Safety Integrity Level is defined as a relative level of risk-reduction provided by a safety function, or to specify a target level of risk reduction. In simple terms, SIL is a measurement of performance required for a Safety Instrumented Function ....
level SIL 3 according to IEC 61508
IEC 61508
IEC 61508 is an international standard of rules applied in industry. It is titled "Functional Safety of Electrical/Electronic/Programmable Electronic Safety-related Systems"....
and safety category Cat. 4 of EN 954-1
Origins
SafetyBUS p has been developed during the years 1995 to 1999 by the company Pilz GmbH & Co. KGPilz GmbH & Co. KG
Pilz GmbH & Co. KG is a company working in the field of safe automation technology , with complete solutions for safety and control technology....
(Germany). It was the target to enable a field bus
Fieldbus
Fieldbus is the name of a family of industrial computer network protocols used for real-time distributed control, now standardized as IEC 61158....
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.
Safety Network International e.V.
Safety Network International e. V. is a user organisation in form of a German eingetragener Verein . As such the organisation is registered at the Amtsgericht Esslingen, Germany. The location of the organisation is Ostfildern, Germany- Origination :Safety Network International e. V. has been...
(previously SafetyBUS p Club International e.V.
Safety Network International e.V.
Safety Network International e. V. is a user organisation in form of a German eingetragener Verein . As such the organisation is registered at the Amtsgericht Esslingen, Germany. The location of the organisation is Ostfildern, Germany- Origination :Safety Network International e. V. has been...
). 70 companies world wide have so far joined the user organization (per 2006) and contribute to the SafetyBUS p technology.
Usage
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:
- Factory automation (e.g. automotive production, press lines)
- Transport systems (like cable cars, fun rides)
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
High availability
High availability is a system design approach and associated service implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period....
system, which typically has no such state, but which is as well classified by SIL levels).
Technology
SafetyBUS p is based on the CANController Area Network
Controller–area network is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer....
field bus. Besides the OSI
OSI
- General :* OSI Pharmaceuticals, an American pharmaceutical company* OSI Restaurant Partners, the restaurant and entertainment group that includes Outback Steakhouse...
layers 1 and 2 defined for CAN, SafetyBUS p adds mechanisms for safety in layers 2 and 7.
Error detection mechanisms
For the detection of errors in transmission and within devices, SafetyBUS p uses the following mechanisms:- Sequential numbering
- Watchdog
- Echo
- Sender and receiver ID
- Check of data integrity using CRC
Technical data
The key data defined by the technology of SafetyBUS p is as follows:- Max 64 bus devices within one network
- Up to 4000 I/O signals per network,
- Transmission rate is 20 to 500 kBaud, depending on the physical size of the network
- Single network segments may be up to 3500 m in size
- Several network segments may be linked
- Guaranteed error reaction times of down to 20 ms may be achieved
- Suitable for applications according to SIL 3 of IEC 61508 and Cat. 4 of EN 954-1
- Optional power supply of the devices over the bus cable
- Network segments may be implemented using radio, fiber-optic or infra-red links.
Devices
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.Safety Network International e.V.
Safety Network International e. V. is a user organisation in form of a German eingetragener Verein . As such the organisation is registered at the Amtsgericht Esslingen, Germany. The location of the organisation is Ostfildern, Germany- Origination :Safety Network International e. V. has been...
.
Organization
The user organization SafetyBUS p Club International e.V.Safety Network International e.V.
Safety Network International e. V. is a user organisation in form of a German eingetragener Verein . As such the organisation is registered at the Amtsgericht Esslingen, Germany. The location of the organisation is Ostfildern, Germany- Origination :Safety Network International e. V. has been...
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.
Safety Network International e.V.
Safety Network International e. V. is a user organisation in form of a German eingetragener Verein . As such the organisation is registered at the Amtsgericht Esslingen, Germany. The location of the organisation is Ostfildern, Germany- Origination :Safety Network International e. V. has been...
.
Literature
- Winfried Gräf: Maschinensicherheit. Hüthig GmbH & Co. KG, Heidelberg 2004, ISBN 3-7785-2941-2
- Armin Schwarz und Matthias Brinkmann: Praxis Profiline - SafetyBUS p - Volume D/J/E. Vogel Industrie Medien GmbH & Co. KG, Würzburg 2004, ISBN 3-8259-1919-6
- Armin Schwarz und Matthias Brinkmann: Praxis Profiline - SafetyBUS p - Volume D/E. Vogel Industrie Medien GmbH & Co. KG, Würzburg 2002, ISBN 3-8259-1915-3
- EU machinery directive: 98/37/EG
- Working paper BIA: Prüfgrundsätzen für sichere Bussysteme
- Reinert, D.; Schaefer, M.: Sichere Bussysteme für die Automation. Hüthig, Heidelberg 2001. ISBN 3-7785-2797-5