Machinery Safety 101

Manual reset using an HMI

A Siemens HMI displaying control functions and data.
This entry is part 2 of 2 in the series Under­stand­ing Safety Functions

Ques­tion: Can a safety-related stop func­tion, for example, be reset via a graph­ic­al object rep­res­ent­ing a reset but­ton on an HMI? The short answer: No, with an excep­tion. Read on if you’d like… 

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Understanding safety functions: Manual Reset

A reset button graphic
This entry is part 1 of 2 in the series Under­stand­ing Safety Functions

Fol­low­ing the risk assess­ment, risk reduc­tion is the next step. Whenev­er the con­trol sys­tem is called upon to reduce the risk, a safety func­tion is needed. Safety func­tions are defined in… 

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What is risk assessment?

This entry is part 11 of 10 in the series Risk Assess­ment

Risk assess­ment began as a dis­cip­line in the late 1960s, with some of the earli­est form­al papers pub­lished in the early 1970s. The early research­ers were part of the US military… 

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Canada’s National Day of Mourning

April 28th poster: Fight for the living, Mourn for the dead.

Fight for the Liv­ing, Mourn for the Dead On April 28th, we mourn for our work­place dead. Canada’s earli­est work­place safety legis­la­tion came into being when Ontari­o’s Fact­ory Act was passed in… 

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What exactly is PELV?

Photo of the interior of an electrical control cabinet showing the components and wireways on the backplane.

What exactly is PELV? Elec­tric­al design­ers run into all kinds of spe­cial­ized ter­min­o­logy as part of their work. IEC is notori­ous for cre­at­ing spe­cial­ized terms that are not famil­i­ar to… 

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Conveyor System Safety

Processing of waste electrical and electronic materials
This entry is part 1 of 1 in the series Con­vey­or systems

If you design, integ­rate or use con­vey­ors in your oper­a­tion, you should have a sol­id grasp on the basic safety require­ments for con­vey­or sys­tems. This art­icle will get you up to speed on everything you need to know! 

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SPCE 2020

The IEEE Sym­posi­um on Product Com­pli­ance Engin­eer­ing is the premi­er product safety engin­eer­ing con­fer­ence, a place where engin­eer­ing pro­fes­sion­als in con­sumer products, IT, med­ic­al, indus­tri­al and pro­fes­sion­al equip­ment gath­er each year… 

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ISO/DIS 13849 – 1 Available for Public Review

Decision tree used to determine PL based on risk parameters.

Update 2020-10-11: The next three-day ISO/TC 199/WG8 meet­ing runs Tues­day-Thursday this week. Our com­mit­tee mem­bers will be wad­ing into the next 1 600 com­ments along with expert mem­bers from around the… 

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Brexit’s impact

Brexit: UK and EU Flags against a blue sky

The UK Con­ser­vat­ive Party win last week has finally drawn an end to the ongo­ing uncer­tainty cre­ated by the Brexit ref­er­en­dum and the dither­ing that fol­lowed the UK Par­lia­ment. Prime… 

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Using Form C relays in safety circuits

I recently had a dis­cus­sion with a col­league who wanted to know if it was OK for a design to include a form C relay in an e‑stop cir­cuit. You might recall that e‑stop functions… 

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