- Q & A: Category 2 and Testing Intervals
- & A: Can Safety PLCs be used for Lockout?”>Q & A: Can Safety PLCs be used for Lockout?
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.
 “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].
 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].
 “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].