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The Fieldbus Foundation announced that Anlagentechnik GmbH, Automation, Software and Information Technology, a global, independent and accredited testing agency, has granted Protocol Type Approval for the Fieldbus Foundation Safety Instrumented Systems specifications. The specifications are in compliance with International Electrotechnical Commission (IEC) 61508 standard (functional safety of electrical/electronic/programmable electronic safety-related systems) requirements up to, and including, Safety Integrity Level 3 (SIL 3).

With the Protocol Type Approval, FOUNDATION fieldbus technology has been extended to provide a comprehensive solution for Safety Instrumented Systems in a wide range of industrial plant applications. The specifications enable manufacturers to build FOUNDATION fieldbus devices in compliance with IEC 61508. Third-party test agencies such as will certify that these devices are suitable for use in safety instrumented systems. End users will be able to choose devices meeting the requirements of IEC 61511 (functional safety: safety instrumented systems for the process industry sector) from multiple suppliers, instead of being restricted to devices designed specifically for a proprietary safety system platform. IEC 61511 is also available as an ANSI/ISA Standard: ANSI/ISA-84.00.01-2004.

Asish Ghosh, ARC Advisory Group, commented, "TUV protocol type approval for the Fieldbus Foundation SIS specification will allow end users to choose internationally certified systems from multiple suppliers that comply with the IEC 61508 and 61511 standards. The end user will no longer be restricted to proprietary or industry standard protocols such as SafetyBUS p or Profisafe. However, as the H1 level solution limits the communication speed to and from field devices, users need to take into account the Fieldbus loading at the design stage."