Common indicator light codes

Illuminated: Indicates that the system is powered on and operational.

Not lit: indicates that the system has not been powered on yet.

Blinking: Indicates that the system is powered on but in a waiting state.

The rated working voltage of the indicator light is 220110, 48, 36, 24, 12, 6, 3 V, etc. Due to the limitation of the current level in the control circuit, and in order to extend the service life of the bulb, it is often adopted to add a current limiting resistor in front of the bulb or use two bulbs in series to reduce the working voltage.