Industrial Automation, PLC, VFD, and Troubleshooting
One of the most common problems in industrial automation is this:
The sensor detects the target, but the PLC input does not turn ON.
Sometimes the sensor LED is ON.Sometimes the sensor …
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In industrial automation, the PLC does not physically “see” the machine, conveyor, door, bottle, box, valve, or actuator. The PLC depends on sensors to know what is happening in the …
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In industrial automation, sensors provide the feedback that allows a PLC to understand what is happening in the real machine. However, not all sensors send the same type of signal.
Some …
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Selecting the right sensor is not just about choosing a device that can detect something.
In industrial automation, the correct sensor must detect the right condition, at the right time, in …
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Photoelectric sensors are one of the most common sensors used in industrial automation. They are used to detect objects without physical contact by using light.
In PLC systems, photoelectric sensors are …
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Capacitive sensors are industrial proximity sensors used to detect materials that many other sensors cannot detect easily.
Unlike an inductive proximity sensor, which is mainly used for metal detection, a capacitive …
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Ultrasonic sensors are industrial sensors used to detect distance, presence, or level by using sound waves.
Unlike photoelectric sensors, ultrasonic sensors do not depend on light reflection. This makes them useful …
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One of the most common troubleshooting situations in industrial automation is when a field sensor appears to be working, but the PLC does not see the input.
A technician may see …
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