SafetyBUS p is a standard for failsafe fieldbus communication in automation technology.
It meets
SIL 3 of
IEC 61508 and
Category
Category, plural categories, may refer to:
Philosophy and general uses
*Categorization, categories in cognitive science, information science and generally
* Category of being
* ''Categories'' (Aristotle)
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* Categories (Peirce) ...
4 of
EN 954-1 or Performance Level "e" of the successor standard EN 13849-1.
Origin
SafetyBUS p was developed by
Pilz GmbH & Co. KG between 1995 and 1999. The objective was to provide a
fieldbus
Fieldbus is the name of a family of industrial computer networks used for real-time distributed control. Fieldbus profiles are standardized by the
International Electrotechnical Commission (IEC) as IEC 61784/61158.
A complex automated industrial ...
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.
Application
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:
*
Factory automation
Automation describes a wide range of technologies that reduce human intervention in processes, namely by predetermining decision criteria, subprocess relationships, and related actions, as well as embodying those predeterminations in machines ...
(e.g. car production, presses)
* Transport technology (e.g. cable cars, fairground rides)
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.
Technology
Technically, SafetyBUS p is based on the fieldbus system
CAN. In addition to
OSI Layers
The Open Systems Interconnection model (OSI model) is a conceptual model that 'provides a common basis for the coordination of SOstandards development for the purpose of systems interconnection'. In the OSI reference model, the communications ...
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.
Fault mechanisms
The following mechanisms are used on SafetyBUS p to detect transmission errors and device errors:
* Sequential numbers
* Timeout
* Echo
* ID for transmitter and receiver
* Data security (CRC)
Technical details
The SafetyBUS p frame data, as determined by the technology, is as follows:
* Maximum 64 bus subscribers per network
* Up to 4000 I/O points per network
* Transmission rates 20 to 500
kbit/s
In telecommunications, data-transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system. Common data rate units are multi ...
, depending on the network extension
* Individual network segments can extend to up to 3500 m
* Multiple network segments can be connected
* Guaranteed error reaction times of up to 20 ms can be achieved
* Suitable for applications in accordance with SIL 3 of IEC 61508 and Cat. 4 of EN 954-1
* Option to supply voltage to the devices via the bus cable
* Subnetworks can be implemented in wireless technology, with fibre-optic cables and as an infrared connection.
Devices
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.
Organisation
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.
Literature
* Winfried Gräf: ''Maschinensicherheit''. Hüthig GmbH & Co. KG, Heidelberg 2004,
* Armin Schwarz und Matthias Brinkmann: ''Praxis Profiline – SafetyBUS p – Volume D/J/E''. Vogel Industrie Medien GmbH & Co. KG, Würzburg 2004,
* Armin Schwarz und Matthias Brinkmann: ''Praxis Profiline – SafetyBUS p – Volume D/E''. Vogel Industrie Medien GmbH & Co. KG, Würzburg 2002,
* EU machinery directive: ''98/37/EG''
IFA Report 2/2017: Funktionale Sicherheit von Maschinensteuerungen – Anwendung der DIN EN ISO 13849
BG ETEM, Prüfgrundsatz GS-ET-26: Bussysteme für die Übertragung sicherheitsrelevanter Nachrichten* Reinert, D.; Schaefer, M.: ''Sichere Bussysteme für die Automation''. Hüthig, Heidelberg 2001. {{ISBN, 3-7785-2797-5
External links
Organizations:
Safety Network International e.V.Safety Network International USA (Regional organization for USA)
Industrial automation
Safety