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Motives for Compromising the Security of an Industrial Control System

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There are multiple motives for compromising the security of an…

Supervisory Control

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In a manually-controlled process, a human operator directly actuates…

Open-ended, Shorted and Properly Terminated Transmission Lines

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Many years ago, when I was first learning about electricity, I…

Digital PID Controllers

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The vast majority of PID controllers in service today are digital in…

Digital Data Communication Theory

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One of the great benefits of digital technology is the ability to…

Examples of PLC Systems

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Programmable logic controllers are essentially nothing more than…

Ultrasonic (Sound) Echo Level Measurement

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A completely different way of measuring liquid level in vessels is to…

Transmission Control Protocol (TCP) and User Datagram Protocol (UDP)

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At the next OSI Reference Model layer (layer 4) is a set of protocols…

WirelessHART Radio Communication Standard

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An exciting development in industrial instrumentation is the…

Input/Output (I/O) Capabilities of PLCs

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Every programmable logic controller must have some means of receiving…

Ethernet networks: Repeaters, Cabling and Switching Hubs

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An engineer named Bob Metcalfe conceived the idea of Ethernet in 1973,…

Design-based Fortifications

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A design-based fortification is one rooted in technical details of…

Chromatography: Methods, Detectors and Species

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Imagine a major marathon race, where hundreds of runners gather in one…

ANSI/IEEE Function Number Codes

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In the United States, the ANSI and IEEE organizations have…

Basics of Bridge Circuits

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A bridge circuit is basically a pair of voltage dividers where the…

Policy-based Fortifications

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These fortifications focus on human behavior rather than system design…

Fiber Optic Data Communication

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Light has long been used as a long-range signaling medium. While…

Introduction to Modbus

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Developed by the Modicon company (the original manufacturer of the…

Glossary of Cyber-security Terms

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Cyber-security seems to have its own vocabulary, ranging from unwieldy…

What is Internet Protocol (IP)?

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I remember first learning about the world-wide Internet, and wondering…

Basic Feedback Control Principles

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Feedback Control System Components Before we begin our discussion on…

Fluid Power Systems

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Given the ability of pressurized fluids to transmit force over long…

Laminar Flowmeters

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A unique form of differential pressure-based flow measurement deserves…

Introduction to Protective Relaying

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Circuit breakers used in residential, commercial, and light industrial…

Motives for Compromising the Security of an Industrial Control System

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There are multiple motives for compromising the security of an…

Unit Conversions and Physical Constants

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Converting between disparate units of measurement is the bane of many…

A Comparison of PID Controller Tuning Techniques

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In this section I will show screenshots from a process loop simulation…

General Problem-solving Techniques

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A variety of problem-solving techniques have been presented for…

Scientific System diagnosis and Scientific Reasoning

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At the root of successful system diagnosis is a rigorous adherence to…

Null-balance Voltage Measurement

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A number of different sensors used in instrumentation generate DC…

Introduction to Calculus

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Few areas of mathematics are as powerfully useful in describing and…

Advantages and Disadvantages of Pneumatic Instruments

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The disadvantages of pneumatic instruments are painfully evident to…

FOUNDATION Fieldbus Function Blocks

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Data-processing modules within FF systems are known as function…

Integral (Reset) Control

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Imagine a liquid-level control system for a vessel, where the position…

Industrial Instrumentation Summary for Teachers

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To summarize some of the key points and concepts for teaching: Do not…

Human-Machine Interfaces (HMIs)

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Human-machine interfaces, or HMIs, are a critical part of nearly all…

The Concept of Differentiation

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Suppose we wished to measure the rate of propane gas flow through a…

Variable-area Flowmeters

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An variable-area flowmeter is one where the fluid must pass through a…

4 to 20 mA Analog Current Signals

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The most popular form of signal transmission used in modern industrial…

Troubleshooting Current Loops

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A fundamental principle in instrumentation system troubleshooting is…