Introduction
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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A limit switch is one of the most common and important feedback devices used in industrial machines.
Unlike photoelectric, inductive, capacitive, or ultrasonic sensors, a limit switch normally requires physical contact …
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In industrial automation, not every feedback signal is a simple ON/OFF input.
Sometimes the PLC or controller needs to know:
How fast is the shaft moving?How far did the conveyor travel?What position …
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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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Sensor wiring is one of the most important parts of a reliable industrial control system.
A PLC program can be well written.The sensor can be the correct model.The machine logic can …
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Industrial sensors are not installed only to turn a PLC input ON or OFF.
They are installed to give the PLC useful feedback from the real machine.
A sensor can tell the …
Read MoreRSLogix 500 and Studio 5000 Examples
In industrial PLC programming, a machine state is a numeric value that tells the program what step or condition the machine is currently in.
Instead of …
Read MoreBuilding Professional and Industrial Ladder Logic with State Machines, Subroutines, and Status Codes
In a basic PLC program, it is common to organize the logic using a simple structure:
Input BufferingMode SelectionRequestsPermissivesInterlocksCommandsFault …
Read MoreA Simple and Professional Way to Organize Ladder Logic
In industrial PLC programming, the logic should not be written randomly. A professional PLC program is usually organized in a clear sequence …
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In industrial automation, one of the most important differences a technician must understand is the difference between a fault and an alarm.
At first, both may look similar because both indicate …
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