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Glossary Term: As-built
A document revision that includes all modifications performed as a result of actual fabrication or installation. Note for safety systems, that where the actual installation does not conform to the design information, then the difference shall be evaluated and the likely impact on safety determined. If the difference has no…
Glossary Term: Architectural constraints or AC
Limitations that are imposed on the hardware selected to implement a safety-instrumented function, regardless of the performance calculated for a subsystem. Architectural constraints are specified (in IEC 61508-2-Table 2 and IEC 61511-Table 5) according to the required SIL of the subsystem, type of components used, and SFF of the subsystem’s…
Glossary Term: Architecture
The voting structure of different elements in a safety instrumented function. See Architectural Constraints, Fault Tolerance and 2oo3.
Glossary Term: Annunciator
A device or group of devices that call attention to changes in process conditions that have occurred. Usually included are sequence logic circuits, labeled visual displays, audible devices, and manually operated acknowledge and reset push buttons.
Glossary Term: Analogue I/O
Input or output signals to or from the filed that vary continuously over a range of values. Typically voltage, electric current, temperature, or pressure signals are analogue.
Glossary Term: Algorithm
A prescribed set of well defined rules or processes for the solution of a problem in a finite number of steps.
Glossary Term: ALARP
As low as reasonably practicable. The philosophy of dealing with risks that fall between an upper and lower extreme. The upper extreme is where the risk is so great that it is rejected completely while the lower extreme is where the risk is, or has been made to be, insignificant.…
Glossary Term: Actuator
A device responsible for putting a mechanical device into action such as a valve. Single acting actuators act in only one direction such as in a spring and diaphragm actuator where the spring acts in a direction opposite to the diaphragm thrust. Double acting actuators have a power supply that…
Glossary Term: IEC 61511
The IEC standard for use of electrical / electronic / programmable electronic safety-related systems in the process industry. Like IEC 61508 it focuses on a set of safety lifecycle processes to manage process risk. It was originally published by the IEC in 2003 and taken up by the US in…
Glossary Term: IEC 61508
The IEC standard covering Functional Safety of electrical / electronic / programmable electronic safety-related systems. The main objective of IEC61508 is to use safety instrumented systems reduce risk to a tolerable level by following the overall, hardware and software safety lifecycle procedures and by maintaining the associated documentation. Issued in…
Glossary Term: 2oo3
Two out of three logic circuit (2/3 logic circuit) A logic circuit with three independent inputs. The output of the logic circuit is the same state as any two matching input states. For example a safety circuit where three sensors are present and a signal from any two of those…
Training Course: Applying IEC 61511 to Burner Management Systems
This Course is Also Offered Online This course provides an overview on how to implement a performance based Burner Management System 〈BMS〉 and move away from the constraints of a prescription based standard for safety function design, especially when waste fuels are introduced into boilers or process heaters. The IEC…
News Item: exida Partner Dr. Willam Goble Gives Presentation on Functional Safety – Device Selection
In affiliation with Control Global, exida Partner Dr. Willam Goble Gives Presentation on Functional Safety – Device Selection. Safety Instrumented Systems consist of an engineered set of hardware and software designed to provide safe failure or maintain safe operation of a process when unacceptable or dangerous conditions occur. Safety system…
Blog Entry: Product Stewardship and Engineering Ethics
Recently I witnessed something I never thought I would in the engineering profession: I was told by a system designer that even though they knew the safety reliability data for one device was too optimistic, they were going to use it because it meant they didn’t need to implement online…
News Item: Belden and exida Combine Security Expertise to Offer Integrated Solution
New Partnership Brings Pragmatic, Consistent Security Approach to Manufacturing Industry ST. LOUIS, Jan 13, 2014 (BUSINESS WIRE)—Belden Inc. , a global leader in signal transmission solutions for mission-critical applications, today announced the signing of a global agreement with exida —a leading consulting firm specializing in industrial automation safety and cyber…
Training Course: IEC 62443 Cybersecurity Software Development
This Course is Also Offered Online The IEC 62443 Security Software Development training course and workshop was created specifically for developers of industrial control system products with a particular focus on network-enabled embedded control system products such as PLCs, DCSs, SISs, RTUs, VFDs, etc. The objective of this course is…
Training Course: IEC 61508 - Functional Safety for Software Design & Development
This Course is Also Offered Online The IEC 61508 family is a performance-based set of standards for functional safety that are commonly applied to the design and development of automatic protection systems in a variety of applications (process industry, industrial / machinery equipment, medical devices, railway, mining, etc.). These standards…
Training Course: IEC 61508 - Functional Safety Overview for Design & Development Leaders
This Course is Also Offered Online The IEC 61508 family is a performance-based set of standards for functional safety that are commonly applied to the design and development of automatic protection systems in a variety of applications (process industry, industrial / machinery equipment, medical devices, railway, mining, etc.). These standards…
Training Course: IEC 61508 - Functional Safety for Design & Development (Electrical, Mechanical, Software)
This Course is Also Offered Online The IEC 61508 family is a performance-based set of standards for functional safety that are commonly applied to the design and development of devices used in automatic protection systems for robotics, industrial / machinery equipment, energy, medical devices, railway, mining, etc. applications. This course…
Training Course: Alarm Rationalization with SILalarm
Attendees will learn how to conduct alarm rationalization of greenfield (new) or brownfield (existing) applications in order to optimize performance of their alarm systems. The class immerses participants in discussion and hands on exercises which have been designed to demonstrate the best practices and requirements for rationalization as taken from…
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