Series: Q&A

Ques­tions & Answers on a vari­ety of ques­tions posed by our read­ers and by attendees at our pub­lic sem­inars.

Q & A: Category 2 and Testing Intervals

This entry is part 1 of 2 in the series Q&A

Dur­ing the Free Safety Talks that we did with Schmersal Canada and Frank­lin Empire, we had a “hot ques­tion” come up regard­ing Cat­egory 2 archi­tec­ture and the test­ing inter­val require­ment. In the short video below, Doug answers that ques­tion.

If you have more ques­tions or felt some­thing wasn’t clear in the video, leave us a com­ment and we will get back to you!

If you are hav­ing prob­lems with devel­op­ing your safety func­tion, please get in touch with Doug dir­ectly.

Notes

Email Doug dir­ectly.

References

[1]     Safety of machinery — Safety-related parts of con­trol sys­tems — Part 1: Gen­er­al prin­ciples for design. ISO 13849 – 1. 2015.

[2]     “The Bathtub Curve and Product Fail­ure Beha­vi­or (Part 2 of 2)”, Weibull.com, 2018. [Online]. Avail­able: http://www.weibull.com/hotwire/issue22/hottopics22.htm. [Accessed: 13- May- 2018].

[3]    Ger­man Social Acci­dent Insur­ance (DGUV) – Insti­tute for Occu­pa­tion­al Safety and Health (BGIA), “Func­tion­al safety of machine con­trols — Applic­a­tion of ISO 13849 – 1 — Report 2/2008e”, Insti­tute for Occu­pa­tion­al Safety and Health (BGIA), Sankt Augustin, DE, 2008.

[4]     “Safety Cir­cuit Examples of Safety Com­pon­ents | Tech­nic­al Guide | Aus­tralia | Omron IA”, Omron.com.au, 2018. [Online]. Avail­able: http://www.omron.com.au/service_support/technical_guide/safety_component/safety_circuit_example.asp. [Accessed: 14- May- 2018].

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Q & A: Can Safety PLCs be used for Lockout?

This entry is part 2 of 2 in the series Q&A

The ques­tion of lock­out and the use of safety PLCs as a means to meet the lock­out require­ments comes up more and more fre­quently these days. Can Safety PLCs be used for lock­out? Safety pro­fes­sion­als don’t always agree on this con­tro­ver­sial top­ic!

Dur­ing the Free Safety Talks that we did with Schmersal Canada and Frank­lin Empire, this hot ques­tion came up, so I thought I’d cov­er it off in a video. If you need some spe­cif­ic help with an applic­a­tion like this, please get in touch with Doug dir­ectly.

There is a lot to say, and in this video I try to cov­er off the reas­ons why Safety PLCs and Lock­out don’t always mix well.

Notes

Ontario Reg­u­la­tion 851, Indus­tri­al Estab­lish­ments

CSA Z432, Safe­guard­ing of Machinery

CSA Z460, Con­trol of haz­ard­ous energy – Lock­out and oth­er meth­ods

ISO 13849 – 1, Safety of machinery — Safety-related parts of con­trol sys­tems — Part 1: Gen­er­al prin­ciples for design

ISO 13849 – 2, Safety of machinery — Safety-related parts of con­trol sys­tems — Part 2: Val­id­a­tion

IEC 62061, Safety of machinery – Func­tion­al safety of safety-related elec­tric­al, elec­tron­ic and pro­gram­mable elec­tron­ic con­trol sys­tems

IEC TR 62061 – 1:2010, Guid­ance on the applic­a­tion of ISO 13849 – 1 and IEC 62061 in the design of safety-related con­trol sys­tems for machinery

Ques­tions? Leave a com­ment below or email Doug.