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.