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Ladder Diagram (LD) Structure Commands

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The simple PLC ladder diagram (LD) commands consist of contacts and…

AC Motor Braking

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There are several different methods useful for causing an AC induction…

Non-contact Temperature Sensors

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Virtually any mass above absolute zero temperature emits…

AC Motor Speed Control

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AC induction motors are based on the principle of a rotating magnetic…

Analysis of Practical Pneumatic Instruments

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To better understand the design and operation of self-balancing…

On/off Electric Motor Control Circuits

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An electric motor is often used as a discrete control element in a…

Integral (Reset) Control

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

Logic Programming in PLCs

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Although it seems each model of PLC has its own idiosyncratic standard…

Ladder Diagram (LD) Programming Contacts and Coils

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In the United States, the most common language used to program PLCs is…

VSD and VFD Motor Drive Features

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Modern DC and AC motor drives provide features useful when using…

Digital Representation of Numerical Data

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Process measurements are often of an analog nature: the temperature of…

Self-regulating, Integrating, and Runaway Process Characteristics

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Perhaps the most important rule of controller tuning is to know the…

Interposing Relays in PLCs

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In addition to directly performing logic functions, electromechanical…

Practical PID Controller Features

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In order for any PID controller to be practical, it must be able to do…

Controller Output Current Loops

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The simplest form of 4-20 mA current loop is the type used to…

Limit Switches

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A limit switch detects the physical motion of an object by direct…

Cascade Control

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A simple control system drawn in block diagram form looks like this:…

Digital PID Controllers

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

Non-dispersive Luft Detector Spectroscopy

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Non-dispersive analysis, while newer in discovery than dispersive…

DC Motor Speed Control

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DC electric motors generate torque by a reaction between two magnetic…

Material Volume Measurement

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A variety of technologies exist to measure the quantity of stored…

Motives for Compromising the Security of an Industrial Control System

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There are multiple motives for compromising the security of an…

Tuning PID Controllers

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Learning how to tune PID controllers is a skill born of much practice.…

Valve Seat Leakage

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In some process applications, it is important that the control valve…

Formulae for Common Chemical Compounds

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Most of these formulae appear in molecular chemical form rather than…

Different PID Equations

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For better or worse, there are no fewer than three different forms of…

Valve Positioners

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The reason why a pneumatic control valve’s stem position…

Laser Spectroscopy

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A laser is a light source emitting waves of light that not only…

Indicators, Recorders, Process Switches and Alarms

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So far we have just looked at instruments that sense, control, and…

FOUNDATION Fieldbus Function Blocks

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

Root Mean Square (RMS) Quantities

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It is often useful to express the amplitude of an alternating quantity…

Introduction to Calculus

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

Bi-metal Temperature Sensors

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Solids tend to expand when heated. The amount that a solid sample will…

Process Flow Diagrams

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To show a practical process example, let’s examine three…

The International System of Units

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The very purpose of physics is to quantitatively describe and explain…

Mechanical Pressure Elements

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Mechanical pressure-sensing elements include the bellows, the…

Chemical Reactor Temperature Control Example

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Sometimes we encounter a diversity of instrument signal standards in…

Process/Instrument Suitability

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Every flow-measuring instrument exploits a physical principle to…

National Institute of Standards and Technology (NIST) Traceability

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As defined previously, calibration means the comparison and adjustment…

Electronic Structure

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Earlier in this chapter you were shown a model of a nitrogen atom with…