A Control Design reader writes: I have a problem, and it may be the stack lights. I'm designing the control system for a large multi-station assembly line in an automotive application. In previous projects, I mounted stack lights and alarm annunciation directly to the main control enclosures and connected digital I/O. Unfortunately, this wasn’t always the best location, and the devices were poorly sealed.
What are some better options for mounting, operating and acknowledging system status and signaling devices? The stack lights will need up to five colors and need to include an audible alarm. These signaling devices must be able to handle a harsh industrial environment and the mounting location varies.
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