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The Art of Manufacturing
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How can humans understand what is happening at any given point in time in a machine? The human machine interface (HMI) provides all such information in the form of alarms, warnings, and status information.
An operator needs to know what the machine is doing at any given point. A machine needs commands from the operator. So, every machine needs an HMI.
On a washing machine, for example, there is a small lamp next to the step of the cycle that is running. There may be a rotary switch to command which cycle step to execute. There may also be a power light to indicate that the machine is switched on. There will also be a power switch. In a more sophisticated machine, there may be a small two-digit display to indicate how many minutes are remaining in the current step. There can also be a small LED display to indicate which operation is in progress, and how...
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