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Learn PLC Wiring & E-Stop Circuit

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PLC Training Video Transcription 1

 

How does an E-stop circuit interacts with a PLC?

 

NEMA has developed a set of standards for Programmable Logic Controllers. This standard recommends thorough consideration of an emergency stop (or safety circuit).

 

PLC E-Stop Circuit video

 

This circuit should be independent of the operation of the Programmable Logic Controller. A part of this standard requires an electromechanical override near the machinery. It is also required when loading or unloading a machine tool or if it cycles automatically. This should be independent of the controller for starting or interrupting the cycle.

 

The PLC wiring tutorial video shows a control relay. When someone presses the emergency stop button, it will cut power to the output module. This will not cycle the power to the processor or interrupt its scanning of the program. But it will deactivate all the output devices, causing a safe condition. Many will recommend a push-pull emergency stop button. Some suggest a single-pole switch to operate the control relay. This circuit will need operator intervention to restart. A safe restart is more likely if the operator controls it.

 

(The software used in the video is at PLC Programming Basics Course  )

 

We offer the following to supplement the video above.

 

We must understand the control circuit's role in safe operations. A reliable safety control circuit is vital. It must manage inputs and outputs and protect the machinery and the operator.

 

The course mentioned above includes the electrical wiring diagrams. These diagrams help technicians and engineers. They ensure that the technicians wire the power supply to provide safe power to the PLC. Even a DC-powered PLC will have its power supply in a single-phase system. So, it’s always important to follow best practices in wiring to avoid potential hazards.

 

One must know the control circuit and wiring diagrams to run a PLC system without failure. Following electrical wiring standards ensures safety and efficiency in your industrial environment.

 

 

See also Free on-line PLC Introduction Videos

Free Online PLC Knowledge Assessments

 

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