Search myKnowledge

Login

Username

Password

Register / Forgot password?

OMRON News

06/08/2024 - OMRON AI Policy Update
22/07/2024 - OMRON Selected as one of the Euronext Vigeo World 120 Index
12/07/2024 - OMRON integrates Digimarc decoding into FH vision system & FHV7 smart camera
19/06/2024 - OMRON introduces VT-X850: The most advanced 3D CT AXI solution to meet critical inspection needs
19/06/2024 - Digimarc and OMRON partner to modernize industrial automation

myKnowledge

Main > Product Type > Safety

Safety

Sub Categories

Emergency Stop Switches (7)	Programmable Safety System (18)	Safety Actuating (1)
Safety Controllers and Relays (6)	Safety Door Switches (13)	Safety Limit Switches (13)
Safety Sensors (2)

Articles

	Is It Necessary To Choose Techniques And Measures From Those Recommended In Annexes A And B Of IEC 61508-2 And IEC 61508-3 In Order To Comply With The Standard? Although all four normative annexes contain recommendations for the use of particular techniques and measures, they differ in what is required for compliance. Table A.1, in s Last Modified - 2009-10-29 - Similar Articles
	Can An E/E/PE Safety-Related System Contain Hardware And/Or Software That Was Not Produced According To IEC 61508, And Still Comply With The Standard (Proven In Use)? It may be possible to use a proven in use argument as an alternative to meeting the design requirements for dealing with systematic failure causes in IEC 61508, including ha Last Modified - 2013-06-12 - Similar Articles
	Can I Get Hold Of Standard IEC 61508 For Free, For Example By Downloading From The Internet? No, IEC 61508 is a priced publication. You can purchase it online from the IEC, or obtain it from the national standards body in your own country. You can download for free t Last Modified - 2016-05-13 - Similar Articles
	Can I Use IEC 61508 As A Standalone Standard? Yes. A major objective of the standard is to enable the development of E/E/PE safety-related systems where application sector international standards do not exist. Many req Last Modified - 2009-10-29 - Similar Articles
	Does IEC 61508 Cover The Elimination Of Hazards At Source? The standard requires that consideration shall be given to the elimination of the hazards and emphasizes the primary importance of eliminating hazards at source (7.4.2.2 and Last Modified - 2008-11-10 - Similar Articles
	Does IEC 61508 Require A Quantitative Risk Analysis To Be Carried Out In Order To Determine Safety Integrity Levels? No. It allows both quantitative and qualitative approaches (see annexes C, D and E of IEC 61508-5). Note that risk analysis generally requires a wide range of expertise. It w Last Modified - 2016-05-13 - Similar Articles
	Does The Mode Of Operation Affect How The Safety Integrity Level Is Determined? First, it is helpful to use a common term hazard rate to examine the differences between low demand mode of operation and high demand or continuous mode of operation. This is Last Modified - 2016-05-13 - Similar Articles
	Can I See Some Practical Examples For IEC 61508? The range of E/E/PE safety-related systems to which IEC 61508 can be applied includes: emergency shut-down systems, fire and gas systems, turbine control, Last Modified - 2016-05-13 - Similar Articles
	How Do I Take Account Of Hazards That Are Introduced By The E/E/PE Safety-Related System? Undertake further hazard and risk analysis when developing the E/E/PE system safety requirements. This should identify any of the states of an E/E/PE safety-related system tha Last Modified - 2009-10-29 - Similar Articles
	How Do Safety Integrity Levels 1 To 4 In IEC 61508 Convert Or Relate To The Categories Described In EN 954-1? Because of the different technical criteria used in IEC 61508 and EN 954-1:1996 (also published as ISO 13849-1:1999), these two standards do not provide a sufficient technical Last Modified - 2016-05-13 - Similar Articles
	How Do The Requirements Of IEC 61508 Change With Respect To The Safety Integrity Level Of The Safety Functions Allocated To The E/E/PE Safety-Related System? IEC 61508 separates the specification of the safety functions to be performed into two elements: the safety function requirements (what the function does); and the Last Modified - 2016-05-13 - Similar Articles
	How Does IEC 61058 Apply Where E/E/PE Technology Makes Up Only A Small Part Of The Safety-Related System? IEC 61508 is applicable to any safety-related system that contains an E/E/PE device. This applicability is appropriate because many requirements, particularly in IEC 61508-1, Last Modified - 2016-05-13 - Similar Articles
	How Does IEC 61508 Apply To Low Complexity E/E/PE Safety-Related Systems? If the standard is used for low complexity E/E/PE safety-related systems, where dependable field experience exists which provides the necessary confidence that the required sa Last Modified - 2016-05-13 - Similar Articles
	In What Ways Do I Need To Consider The Impact Of Human Activities On The Operation Of An E/E/PE Safety-Related System? IEC 61508 requires human factor issues to be considered in the determination of hazards and hazardous events (7.4.2.3 of IEC 61508-1) and in the design of the E/E/PE safety-re Last Modified - 2016-05-13 - Similar Articles
	Is Application Of IEC 61508 Compulsory Under Any EC Directive? No. EN 61508 does not have the status of a harmonized European standard, and is not referred to by any EC Directive. However, this does not prevent compliance with relevant p Last Modified - 2016-05-13 - Similar Articles
	Is IEC 61508 Also A European Standard? Yes. The seven parts of IEC 61508 were published by CENELEC in December 2001 as EN 61508. All CENELEC member countries had to implement EN 61508 at national level by August 2 Last Modified - 2016-05-13 - Similar Articles
	Is IEC 61508 Only Concerned About Ensuring Safety By Improving Reliability? No. A vital first step in the safety lifecycle is that the necessary safety functions are derived from an analysis of the hazards and risks. It is not only the safety integrit Last Modified - 2016-05-13 - Similar Articles
	Is IEC 61508 Relevant To Me? Generally, the significant hazards for equipment and any associated control system have to be identified by the specifier or developer via a hazard analysis. The analysis iden Last Modified - 2016-05-13 - Similar Articles
	Is There Any Correlation Between The Level Of Independence Required For Functional Safety Assessment And The Need For Third Party Certification? This will depend upon the company organization and expertise within the company. For some companies even the requirement for independent persons and departments may have to be Last Modified - 2008-11-11 - Similar Articles
	Now I’ve Obtained A Copy Of The Standard, How Do I Go About Reading It? Annex A of IEC 61508-5 provides introductory material on risk and safety integrity. In IEC 61508-1, the overall safety lifecycle requirements contained in clause 7 are summari Last Modified - 2008-11-11 - Similar Articles
	Suppliers Are Quoting That Their Products Conform To IEC 61508 For A Specific Safety Integrity Level. Does This Mean That Using These Products Is Sufficient For Me To Comply With IEC 61508? No. A safety integrity level is not directly applicable to individual subsystems or components. It applies to a safety function carried out by the E/E/PE safety-related system Last Modified - 2009-10-29 - Similar Articles
	What Application Sector Or Subsystem Standards Based On IEC 61508 Are There? The following application sector standards have been published: IEC 61513, Nuclear power plants – Instrumentation and control for systems important to safety – Ge Last Modified - 2016-05-13 - Similar Articles
	What Does E/E/PE Mean? E/E/PE is an abbreviation of electrical/electronic/programmable electronic. 3.2.6 of IEC 61508-4 defines this as based on electrical and/or electronic and/or programmable elec Last Modified - 2016-05-13 - Similar Articles
	What Does IEC 61508 Consist Of? The standard is published in parts as shown in the table below. Only parts 1 to 4 contain normative requirements. This text contains extracts from the IEC Functi Last Modified - 2016-05-13 - Similar Articles
	What Does Software Safety Integrity Mean In The Context Of Safety Integrity Being Defined As Probability Of Failure? A safety integrity level (SIL) applies to an end-to-end safety function of the safety-related system. Like any other system component, software has no safety integrity level i Last Modified - 2016-05-13 - Similar Articles
	What Factors Should I Take Into Account When Planning To Use A Risk Graph Method For Determining Safety Integrity Levels? Annex D of IEC 61508-5 describes in principle a risk graph method for determining safety integrity levels, using a generalised example. The example figures in annex D are not Last Modified - 2013-06-12 - Similar Articles
	What Is A Basic Safety Publication? Parts 1, 2, 3 and 4 of IEC 61508 are designated as IEC basic safety publications. This means that IEC Technical Committees will have to use these parts in the preparation of e Last Modified - 2016-05-13 - Similar Articles
	What Is A Low Complexity E/E/PE Safety-Related System? This is defined in 3.4.4 of IEC 61508-4 as an E/E/PE safety-related system, in which the failure modes of each individual component are well defined and the behaviour of the s Last Modified - 2016-05-13 - Similar Articles
	What Is A Mode Of Operation? IEC 61508 describes two modes of operation for a safety function. These are low demand mode of operation and high demand or continuous mode of operation. The terms are formall Last Modified - 2016-05-13 - Similar Articles
	What Is A Safety Integrity Level (SIL)? A safety integrity level is one of four levels, each corresponding to a range of target likelihood of failures of a safety function. Note that a safety integrity level is a pr Last Modified - 2016-05-13 - Similar Articles
	What Is A Safety-Related System In The Context Of IEC 61508? A safety-related system comprises everything (hardware, software and human elements) necessary to carry out one or more safety functions, where failure of the safety function Last Modified - 2016-05-13 - Similar Articles
	What Is Functional Safety Assessment? This is the critical activity that ensures functional safety has actually been achieved. Those carrying out the functional safety assessment shall be competent, shall have ade Last Modified - 2016-05-13 - Similar Articles
	What Is Functional Safety? Functional safety is part of the overall safety that depends on a system or equipment operating correctly in response to its inputs. Functional safety is achieved when every s Last Modified - 2016-05-13 - Similar Articles
	What Is Meant By A SILn System, Subsystem Or Component? A safety integrity level (SIL) is not a property of a system, subsystem or component. The correct interpretation of this phrase is that the system, subsystem or component is c Last Modified - 2016-05-13 - Similar Articles
	What Is The Difference Between Low Demand Mode Of Operation And High Demand Or Continuous Mode Of Operation ? Modes of operation are used in IEC 61508 to describe two types of safety function carried out by E/E/PE safety-related systems. The modes are relevant when relating the target Last Modified - 2009-10-29 - Similar Articles
	What Is The International Status Of IEC 61508? Adoption of IEC International Standards by any country, whether it is a member of the IEC or not, is entirely voluntary. IEC National Committees undertake to apply IEC Interna Last Modified - 2009-10-29 - Similar Articles
	What Systems Does IEC 61508 Cover? IEC 61508 applies to safety-related systems when one or more of such systems incorporate electrical and/or electronic and/or programmable electronic (E/E/PE) devices. It cover Last Modified - 2009-10-29 - Similar Articles
	Which Requirements Do I Need To Satisfy In Order To Claim Compliance With The Standard? The term shall used in a requirement indicates that the requirement is strictly to be followed if conformance to the standard is to be claimed. Where should (or it is recomme Last Modified - 2016-05-13 - Similar Articles
	What Are The Symbols For NC And NO Contacts? NO Contacts: Contacts that are normally open. Electrical Symbol: CX-Programmer Ladder Symbol: NC Contacts: Contacts that are normally closed. Electric Last Modified - 2009-10-27 - Similar Articles
	What Is Redundancy? Redundancy is a protection policy using duplication. The probability of hazards arising from one malfunction in an system can be minimized by creating partial or complete Redu Last Modified - 2009-03-09 - Similar Articles
	Why Is NE1A-SCPU01L Not Shown In The Network Configurator? The problem why the NE1A-SCPU01L or NE1A-SCPU02L is not in the "Network Configurator" is that the EDS file may be installed incorrectly. Here is how you can fix it: Last Modified - 2010-06-10 - Similar Articles
	What Is The Contact Rating And Minimum Switching Characteristic Of The Standard type D4BS (Silver Alloy Contacts) Door Switch? The contact material of D4BS-15FS is silver alloy. D4BS-15FS is used for general load, so this switch's applicable load range is Zone 4. (Please see below figure) Minimum ap Last Modified - 2010-09-17 - Similar Articles
	What Is The Contact Material Of The G7SA Safety Relay? The contact material of G7SA is AgSnIn (base material) and Au (surface material). Last Modified - 2010-09-17 - Similar Articles

Glossary

You are not logged in.

Search myKnowledge

Login

Username Password Register / Forgot password?

OMRON News

myKnowledge

Safety

Username

Password

Register / Forgot password?