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Panel indicators are usually employed in factory automation systems where they provide visual cues of the current machine state or process being monitored. This can include things like indication of power, operation, fault, and other machine states. Applications such as these require precise, reliable, and unconditional monitoring of the machine state that a panel indicator can provide.

The most common type of panel indicator is the LED or Light Emitting Diode. LEDs are very reliable, efficient, and inexpensive. They are also very suited to machine control applications and don’t require additional components for their operation. LEDs offer long life and can be seen from a distance, making them an ideal choice for machine monitoring applications.

Pilot lights are also often used in factory automation systems. This type of panel indicator is typically used to indicate the presence of power, or warn of a fault condition. Pilot lights are usually large and highly visible from a distance, and also feature a prime color (red or green) that makes them distinctive from other types of indicator. As a type of panel indicator, pilot lightsare extremely reliable and long lasting.

The working principle of panel indicators is usually very straightforward. Generally, when an input signal, such as power or a fault state, is received, an electric currenterodes through the indicator’s terminals and the light on the indicator is illuminated. Depending on the type of indicator, it will remain illuminated when the signal is present, and will turn off when the signal is absent.

LEDs are also capable of being used in a variety of applications in factory automation systems. These include a variety of warning and indication systems such as status lights, alarm systems, and even in some cases, as an indication that the current system is in a safe state for operation. LEDs are also widely used as a backlight in various automation systems.

Panel indicators, such as LEDs and pilot lights, are essential components in today\'s factory automation systems. They are reliable and relatively inexpensive, and provide a clear indication of the current machine state or process that is being monitored. And with their easy installation, and long life, they are the perfect choice for any automation application where visual feedback or monitoring is needed.

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