Canada

Testing Emergency Stop Systems

Posted on
This entry is part 11 of 15 in the series Emer­gency Stop

I’ve had a num­ber of ques­tions from read­ers regard­ing test­ing of emer­gency stop sys­tems, and par­tic­u­larly with the fre­quency of test­ing. I addressed the types of tests that might be needed in anoth­er art­icle cov­er­ing Check­ing Emer­gency Stop Sys­tems. This art­icle will focus on the fre­quency of test­ing rather than the types of tests. The Prob­lem Emer­gency […]

Control Functions

Inconsistencies in ISO 13849 – 1:2006

Posted on
This entry is part 7 of 8 in the series Cir­cuit Archi­tec­tures Explored

I’ve writ­ten quite a bit recently on the top­ic of cir­cuit archi­tec­tures under ISO 13849 – 1, and one of my read­ers noticed an incon­sist­ency between the text of the stand­ard and Fig­ure 5, the dia­gram that shows how the cat­egor­ies can span one or more Per­form­ance Levels. If you look at Cat­egory 2 in Fig­ure 5, you will notice […]

Uncategorized

Bye, Steve. Thanks for everything!

Posted on

Today marks a turn­ing point for me. With the loss of Steve Jobs, the world is a less­er place. His bril­liance, vis­ion and cha­risma changed the world for the bet­ter in so many ways. As any­one who knows me well will tell you, I am a pas­sion­ate Mac user. I became a believ­er in 1991 when my then-girl­­friend intro­duced me to […]