Machinery Safety 101

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. The defin­i­tion of Cat­egory 2 in 6.2.5 does not include any men­tion of a min­im­um test­ing rate, but 4.5.4 “Sim­pli­fied pro­ced­ure for estim­at­ing the quan­ti­fi­able aspects of PL” adds a require­ment for test rate and MTTFD for the Test Equip­ment. 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), “BGIA Report 2/2008e — Func­tion­al safety of machine con­trols — Applic­a­tion of ISO 13849 – 1”, Insti­tute for Occu­pa­tion­al Safety and Health (BGIA), Sankt Augustin, DE, 2008. Avail­able: https://www.dguv.de/medien/ifa/en/pub/rep/pdf/rep07/biar0208/rep22008e.pdf. [Accessed: 22-Nov-2019].

[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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Series Nav­ig­a­tion& A: Can Safety PLCs be used for Lockout?”>Q & A: Can Safety PLCs be used for Lock­out?

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