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Panel indicators, pilot lights are commonly used in industrial automation, and they are widely applied in many field, such as control system, monitoring system, signaling system, and so on. In fact, these two types of electrical components play an important and irreplaceable role in different environment. Generally speaking, their application field and working principle are as follows.

Application field

• Control System: Panel indicators and pilot lights are mainly used to show the running state of automic control system, as well as give the operator the response to their operation, so as to facilitate the control and monitor the running situation.
• Monitoring System: As a part of the monitoring system, panel indicators and pilot lights can provide information to users which is helpful for fault location.
• Signaling System: Panel indicators and pilot lights can be used for warning and call, such as in various fire alarm systems.

Working Principle
Panel indicators and pilot lights were mainly used to provide visual signal for operators. For panel indicators, when a current flows through the LED light, the panel indicators will emit light of certain color. Different colors on the indicators can indicate different state of the system. As for pilot lights, they are usually powered by capacitors and driven by relays. When the relays received the voltage signal, the capacitors will be charged and a certain current will be generated. Then the light will be lit. Meanwhile, a pilot light can also control a mechanical component or jump the connection.

In a word, panel indicators and pilot lights are essential elements in the signaling system and automic control systems, and the color code on the indicators can provide necessary and timely information for the operators. No matter in which environment and which application fields, they both show their significance.

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