How to understand the sensor signal indicator light

• time：2023-09-04 13:08:23
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To understand the sensor signal indicator light, you first need to know the working principle of the sensor and the corresponding relationship between the status of the indicator light.

Normally, the sensor signal indicator light will have two states: on and off.

"Off" in Normally Open (NO) state: This means that when the sensor does not detect the target or the trigger conditions are not met, the indicator light will be off.

Normally closed (NC) state is "on": This means that when the sensor detects the target or the trigger condition is met, the indicator light will be lit.

When the signal indicator light is inconsistent with the sensor feedback signal, it may indicate an abnormality or malfunction. Possible reasons include the following:

1. Wrong wiring between sensor and equipment: Check whether the wiring of the sensor is correctly connected to the equipment and ensure that the wiring is correct.

2. Wrong working voltage: Make sure that the working voltage of the sensor and the device match. If the voltage is incorrect, it may cause the signal indicator light to be abnormal.

3. Poor contact of the equipment: Check whether there is poor contact in the circuit of the equipment, which may cause internal instability of the sensor.

4. Sensor self-protection: The working voltage is too high, the instantaneous short-circuit current and voltage are too high, or the long-term short-circuit causes the output tube to break down, the signal light changes, but there is no signal output.

5. Sensor damage: The signal light flashes, there is no signal change, there is a short circuit in the equipment and connections, and the switch may be directly damaged or in a saturated state if left untreated for a long time.

It should be noted that different sensors and manufacturers may have different design principles and abnormal behavior. Therefore, when interpreting a sensor signal indicator, it is best to refer to the sensor's instruction manual or contact the manufacturer for information and troubleshooting guidance on your specific sensor.