Understanding the Operation of Limit Controllers
The application of limits within an online controlled system and operation network provides key safety features. They come in multiple forms, from thermal versions to other sensory-driven restrictions. Integrated properly into a manufacturing network, limits can catch risks and growing problems faster and better than human monitors assigned to tag-out or safety switch. Further, limits work in a 24/7 capacity, never getting tired and maintaining reliability as long the equipment is kept in operating condition and protected. Hardware and Software Choices Limits come in multiple options. Mechanical hardware limits follow technology that has been around for years, generally utilizing a physical temperature sensor to trigger a mechanical reaction, typically one connected to a switch that shuts of power or fuel flow to a process. Mechanical limits are also often referred to as analog limits and usually have an advantage in applications where computerized equipment does not work so well or...