Roundtable discussion focuses on how to reduce confusion and complement indications WHAT ARE STACKLIGHTS, buttons, switches and alarms trying to say to us? And how do we ensure that operators can understand the language they're speaking? We asked a panel of industry experts to share their opinions on the use of these time-tested devices. Red, yellow, green and blue are standard stacklight colors. But a variety of other colors can be used to indicate specific conditions and needs. What are the pros and cons of additional colors or flashing patterns? Are they helpful, or do they just create confusion? The red-yellow-green color assignment is fairly well agreed upon. Red is bad - machine down, e-stop active, device faulted. Yellow is typically a warning condition, such as temperature is at a low boundary but hasn't reached a low-low boundary. Green is good - machine running or running at rate.
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