Learn 4-20 mA Analog Signals in PLC Systems for Beginners from Udemy

The 4-20mA current loop is the backbone of industrial automation and process control. From PLC (Programmable Logic Controller) systems to sensor-based instrumentation, 4-20mA signals play a vital role in transmitting accurate and noise-resistant data across long distances. But have you ever wondered why 4-20mA was chosen? Why not 0-10V, 0-20mA, or any other range?

This Electrical and Instrumentation Basic Course is designed to provide a deep understanding of the 4-20mA standard, explaining its origin, advantages, disadvantages, and why it dominates the industry today. This basic course helps engineers, technicians, students, or automation enthusiasts to learn the fundamentals of this essential 4-20 mA signal transmission method in PLC systems.

Why Learn About 4-20mA?

Industrial sensors, actuators, and controllers rely on accurate signal transmission to maintain precision and efficiency. The 4-20mA current loop ensures that data remains stable, interference-free, and consistent—even across long distances. Learning about this fundamental technology helps professionals troubleshoot, optimize, and design better control systems.

What You’ll Learn

Why 4-20mA?: The history and reasoning behind choosing 4-20mA over other signals.
Origins of 4-20 mA: Understand why 4 mA serves as the “live zero” and 20 mA is chosen as the upper limit.
Advantages & Disadvantages: Explore how 4-20 mA reduces noise interference, ensures reliable signal transmission, and why it sometimes needs extra components for voltage-based systems.
Why 4-20mA is used in PLCs?: How PLCs process analog input signals.
Practical Applications: See real-world examples of 4-20 mA in process control, industrial instrumentation, and sensor feedback loops.
Why It’s Widely Adopted: Discover how 4-20 mA maintains accuracy over long distances, powering many field devices without extra wiring.

Who Should Enroll

This course is perfect for beginners, professionals, engineering students, engineers & technicians, or anyone eager to learn the core principles of 4-20 mA in electrical and instrumentation systems.

By the end of this course, you’ll know exactly why 4-20 mA is central to industrial electronics and instrumentation engineering, and how to apply it in your own projects or career. Join us to unlock the secrets behind the most trusted current loop in the industry.

What's inside

Learning objectives

Understand the fundamentals of analog signals.
Basics of plc automation.
Learn why 4 ma and 20 ma specific limits are chosen for analog signal ranges.

Understand why 4-20 ma is used in electrical and instrumentation systems.
Advantages and disadvantages of 4-20 ma current signals.
Learn about industry standards and best practices

Understand the fundamentals of analog signals.
Basics of plc automation.
Learn why 4 ma and 20 ma specific limits are chosen for analog signal ranges.
Understand why 4-20 ma is used in electrical and instrumentation systems.
Advantages and disadvantages of 4-20 ma current signals.
Learn about industry standards and best practices

Syllabus

Industry Live Example

Analog Inputs in PLC

Introduction to PLC Automation

The Industrial Plant

Traffic lights

Read about what's good

what should give you pause

and possible dealbreakers

Explores the history and reasoning behind the 4-20mA standard, which is helpful for anyone looking to understand the evolution and context of industrial automation

Covers the advantages and disadvantages of 4-20 mA current signals, which is essential for making informed decisions in system design and troubleshooting

Examines the transition from pneumatic to analog instruments, which provides valuable historical context for understanding current industrial practices

Discusses the limitations of 4-20mA, such as magnetic field and crosstalk problems, which may require learners to seek additional knowledge about mitigation strategies

Focuses on the 4-20mA current loop, which is a cornerstone of industrial automation and process control, making it highly relevant for professionals in these fields

Explores the use of 4-20mA in PLC systems, which is a foundational topic for anyone working with programmable logic controllers in industrial settings

Reviews summary

Learn 4-20 ma plc signals

Analysis of student feedback for "Learn 4-20 mA Analog Signals in PLC Systems for Beginners" could not be completed as the required review data was not provided. Therefore, this summary is based solely on the course description. The course targets beginners, professionals, engineers, and technicians in industrial automation. It is described as covering the fundamentals of the 4-20mA standard, its history, advantages, disadvantages, and practical applications in PLC systems. Key topics include the rationale for the 4 mA and 20 mA limits, historical context, fault detection, and distance transmission benefits. Without reviews, specific learner experiences cannot be reported.

Required student review data was not supplied.

"The JSON payload containing the 'reviews' array and 'distribution' object was not included in the input."

"Unable to analyze student feedback, sentiment, or specific points raised by learners from the provided data."

"Analysis of course attributes based on student experience and review distribution is not possible without the complete dataset."

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Learn 4-20 mA Analog Signals in PLC Systems for Beginners with these activities:

Review Basic Electrical Circuits

Show steps

Reinforce your understanding of fundamental electrical circuit concepts. This will provide a solid foundation for understanding how 4-20mA signals are implemented and interpreted in PLC systems.

Browse courses on Ohm's Law

Show steps

Review Ohm's Law and Kirchhoff's Laws.
Practice solving simple series and parallel circuit problems.
Understand the concepts of voltage and current dividers.

Explore 'Instrumentation and Control Systems' by W. Bolton

Show steps

Gain a broader perspective on instrumentation and control systems. This will help you understand how 4-20mA signals fit into the larger context of industrial automation.

View Instrumentation and Control Systems on Amazon

Show steps

Read the sections related to analog signal transmission and processing.
Focus on the chapters that discuss current loops and their applications.
Take notes on key concepts and diagrams.

Read 'Programmable Logic Controllers' by Frank Petruzella

Show steps

Gain a broader understanding of PLC systems. This will help you contextualize the role of 4-20mA signals within the larger automation framework.

View Melania on Amazon

Show steps

Read the chapters related to analog inputs and outputs.
Study the examples of PLC programs that use analog signals.
Take notes on key concepts and terminology.

Four other activities

Expand to see all activities and additional details

Show all seven activities

Practice I to V Conversion Calculations

Show steps

Improve your proficiency in converting current signals to voltage signals. This is a fundamental skill for working with 4-20mA systems.

Show steps

Find or create practice problems involving I to V conversion.
Solve the problems and check your answers.
Review the formulas and concepts if you encounter difficulties.

Follow Online Tutorials on 4-20mA Loop Calibration

Show steps

Learn practical techniques for calibrating 4-20mA loops. This will enhance your ability to troubleshoot and maintain industrial instrumentation systems.

Show steps

Search for reputable online tutorials on 4-20mA loop calibration.
Follow the steps in the tutorials to calibrate a simulated or real 4-20mA loop.
Document the calibration process and any challenges encountered.

Build a Simple 4-20mA Simulator

Show steps

Solidify your understanding of 4-20mA signals by building a simulator. This hands-on project will reinforce your knowledge of the underlying principles and practical considerations.

Show steps

Research and select appropriate components for the simulator.
Design the circuit for the 4-20mA simulator.
Build and test the simulator.
Document the design and testing process.

Create a Presentation on 4-20mA Applications

Show steps

Deepen your understanding by researching and presenting real-world applications of 4-20mA signals. This will help you connect the theoretical concepts to practical scenarios.

Show steps

Research different applications of 4-20mA signals in industrial automation.
Create a presentation outlining the applications and their benefits.
Practice delivering the presentation to a friend or colleague.

Career center

Learners who complete Learn 4-20 mA Analog Signals in PLC Systems for Beginners will develop knowledge and skills that may be useful to these careers:

Instrumentation Engineer

An Instrumentation Engineer designs, develops, and maintains the instruments and control systems used in industrial processes. This course is directly applicable to this role, as it provides a deep understanding of the 4-20mA standard. Learning about the history and reasoning behind choosing 4-20mA, its advantages and disadvantages, and how it ensures reliable signal transmission is very relevant. The course's exploration of practical applications of 4-20mA in process control and sensor feedback loops, as well as industry standards, helps you design and maintain accurate and efficient instrumentation systems. Instrumentation Engineers will find this course to be a powerful tool.

See salaries and explore the career path for Instrumentation Engineer

Instrumentation Technician

An Instrumentation Technician installs, maintains, and calibrates instruments and control systems in industrial settings. This course helps you understand the 4-20mA standard, essential for transmitting accurate data in PLC systems, which is critical for this role. You will gain insights into the origins of the standard, its advantages and disadvantages, and how it reduces noise interference, all essential for ensuring reliable signal transmission. The course’s exploration of real-world applications of 4-20mA in process control and sensor feedback loops prepares you for troubleshooting and optimizing control systems as an Instrumentation Technician.

See salaries and explore the career path for Instrumentation Technician

Process Control Engineer

A Process Control Engineer designs and implements control strategies to optimize industrial processes. The 4-20mA standard, the focus of this course, is the backbone of process control. The course helps you understand the origins, advantages, and disadvantages of 4-20mA, and why it dominates the industry. Gaining insights into how PLCs process analog input signals and exploring real-world applications in process control strengthens your ability to design and troubleshoot control systems. Furthermore, with this course, Process Control Engineers are prepared to leverage this knowledge for immediate improvements.

See salaries and explore the career path for Process Control Engineer

PLC Programmer

A PLC Programmer develops and maintains the software that controls automated systems. This course helps PLC Programmers by providing a deeper understanding of the 4-20mA standard, a core component of PLC systems. Learning why 4-20mA is used in PLCs and understanding how PLCs process analog input signals is invaluable. The course's coverage of real-world examples of 4-20mA in process control and sensor feedback loops helps you write more effective and reliable PLC code. Learning about the advantages and disadvantages of the 4-20mA standard may also assist in debugging and optimization.

See salaries and explore the career path for PLC Programmer

Control Systems Engineer

A Control Systems Engineer designs and implements control systems for industrial processes. This course helps build a foundation in the 4-20mA standard, which is fundamental to many control systems. Understanding the reasons behind choosing 4-20mA over other signals, as well as the advantages and disadvantages, helps develop robust and efficient control strategies. You will also benefit from learning about how PLCs process analog input signals and the practical applications of 4-20mA in various industrial settings. All of this is relevant when designing and troubleshooting control systems.

See salaries and explore the career path for Control Systems Engineer

Automation Engineer

An Automation Engineer designs, develops, and implements automated systems. This course is directly relevant, as it focuses on the 4-20mA current loop, a fundamental component of industrial automation. Understanding the history and reasoning behind choosing 4-20mA, its advantages and disadvantages, and its role in PLC systems is essential for anyone in this role. The course's exploration of practical applications in process control and sensor feedback loops provides valuable context. Learning about industry standards and best practices, covered in this course, may help you design and optimize automated systems.

See salaries and explore the career path for Automation Engineer

Electrical Engineer

An Electrical Engineer designs, develops, and tests electrical equipment and systems. This course can be a great introduction to the 4-20mA standard, a commonly used signal transmission method in industrial settings. Understanding the principles behind 4-20mA, its advantages, and disadvantages, can be useful. The course's focus on practical applications of 4-20mA in process control and sensor feedback loops may provide context for electrical engineers working in automation or industrial settings. Electrical Engineers are well-equipped to delve into the more intricate aspects of electrical and instrumentation systems.

See salaries and explore the career path for Electrical Engineer

Calibration Technician

A Calibration Technician calibrates and maintains instruments to ensure their accuracy and reliability. A thorough understanding of the 4-20mA standard, a focus of this course, is very helpful. The course clarifies the origins of the standard, its advantages, and disadvantages, along with its role in ensuring reliable signal transmission, all of which are directly relevant to calibration work. The course's coverage of real-world applications of 4-20mA in process control and sensor feedback loops strengthens your ability to perform accurate and effective calibrations.

See salaries and explore the career path for Calibration Technician

Maintenance Technician

A Maintenance Technician maintains and repairs industrial equipment, including control systems. This course is useful for understanding the 4-20mA standard, which is frequently encountered in industrial settings. Understanding the principles behind 4-20mA, its advantages, and disadvantages, can be useful for troubleshooting and repairing equipment. The course's focus on practical applications of 4-20mA in process control and sensor feedback loops, as well as its insights into how PLCs process analog input signals, may provide a context for diagnosing and resolving issues on the job. Maintenance Technicians will find these skills to be directly applicable in their daily work.

See salaries and explore the career path for Maintenance Technician

SCADA Engineer

A SCADA Engineer designs and maintains Supervisory Control and Data Acquisition (SCADA) systems. This course may be valuable, as understanding the 4-20mA standard can be relevant to SCADA systems that interface with industrial sensors and instruments. This course may provide additional insights into why 4-20mA is used and how it ensures reliable signal transmission. Its exploration of practical applications of 4-20mA in process control and sensor feedback loops helps in understanding how field devices communicate data to SCADA systems. SCADA Engineers can use this foundational knowledge to ensure the integrity of field data.

See salaries and explore the career path for SCADA Engineer

Systems Integrator

A Systems Integrator combines different systems into a cohesive whole. This course may be helpful, as the 4-20mA standard is a common interface between different industrial components. It helps understand the advantages and disadvantages of 4-20mA, which may be useful when integrating various systems. The course's exploration of practical applications of 4-20mA can provide context for how different components communicate. Systems Integrators who have a solid foundation may find it easier to integrate systems smoothly.

See salaries and explore the career path for Systems Integrator

Robotics Technician

A Robotics Technician installs, maintains, and repairs robotic systems. This course could supplement existing knowledge by highlighting how 4-20mA signals are used in sensor feedback loops. The course explains the basics of the 4-20mA standard, which is relevant to the input signals robots use to make decisions. Although robotics relies heavily on digital communication, understanding analog signals may give a well-rounded foundation. The course may enhance your comprehension of how robots interact with the environment.

See salaries and explore the career path for Robotics Technician

Industrial Electrician

An Industrial Electrician installs and maintains electrical systems in industrial facilities. While Industrial Electricians work with a wide range of electrical systems, this course may offer valuable insights into a specific signal transmission standard commonly used in industrial automation. Understanding the basics of 4-20mA signals, and their advantages, may provide context for the types of signals and components in automated systems. It could also aid in troubleshooting issues related to signal transmission. This foundational knowledge can complement the broader electrical skillset.

See salaries and explore the career path for Industrial Electrician

HVAC Technician

An HVAC Technician installs, maintains, and repairs heating, ventilation, and air conditioning systems. While HVAC systems often use digital controls, this course may be helpful in understanding the analog signals used by some sensors and actuators. This course may provide insights into the basics of the 4-20mA standard, a common method of signal transmission. Although not all HVAC systems use 4-20mA, understanding its advantages and disadvantages may provide a broader understanding of control systems. This foundational knowledge can complement the core HVAC skillset.

See salaries and explore the career path for HVAC Technician

Lab Technician

A Laboratory Technician performs tests and experiments in a lab setting. While not always directly applicable, this course may be useful if the lab uses instruments that rely on 4-20mA signal transmission. This course may provide a foundational understanding of why 4-20mA is used and how it ensures reliable data transmission. In cases where lab instruments rely on these signals, knowledge of the standard, its advantages, and disadvantages may be helpful. This knowledge can complement the existing skill set of a Lab Technician.

See salaries and explore the career path for Lab Technician

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in Learn 4-20 mA Analog Signals in PLC Systems for Beginners.

Instrumentation and Control Systems

Save

Provides a broad overview of instrumentation and control systems, including detailed explanations of analog signal transmission and processing. It useful reference for understanding the context in which 4-20mA signals are used. This book adds more breadth to the existing course and is commonly used by industry professionals.

Instrumentation and Control Systems

Kindle Edition

Learn 4-20 mA Analog Signals in PLC Systems for Beginners

What's inside

Learning objectives

Syllabus

Traffic lights

Save this course

Reviews summary

Learn 4-20 ma plc signals

Activities

Career center

Reading list

Share

Similar courses