In 1995 CEN published an important standard for machine builders – EN 954 – 1, Safety of Machinery – Safety Related Parts of Control Systems – Part 1: General Principles for Design. This standard set the stage for defining control reliability in machinery safeguarding systems, introducing the Reliability categories that have become ubiquitous. So what do these categories mean, and how are they applied under the latest machinery standard, ISO 13849 – 1?
Macworld was invited inside Apple’s EMC test lab for a tour – the first time journalists have been permitted into this area. This article looks at what Apple does to make sure their products meet EMC design requirements. Testing industrial equipment is often simpler that this, and you don’t need to buy your own labs to do it. Are your machine designs compliant? Would you know if they
Did you know that interlocked gates require stopping performance testing?
Machinery needs to be able to stop in the time it takes a person to open the guard and reach the hazard. If the distance from the guard opening to the hazard is short enough that a person can reach the danger point before the hazard can be controlled, the guard is useless. The resulting situation may be worse