The Role of Control Devices in Automation Technology

Vocabulary-style flashcards covering the core control devices, their technical definitions, and roles in industrial automation technology.

Automation

The technology by which a process or procedure is performed with minimal human assistance.

Control Devices

The "brain" or "switch" of a system that makes decisions based on inputs.

Relays

An electromagnetic or electronic switch that can be opened or closed by a relatively small electrical current to safely control a much larger current.

Electromechanical Relays (EMR)

Relays that use physical, moving components where an electrical current energizes a magnetic coil to physically pull an armature and open or close mechanical contacts.

Timers

A device that delays or tracks time intervals to control when an output action starts or stops.

On-Delay

A timer setting that waits for a set time after receiving a signal before turning something on.

Off-Delay

A timer setting that keeps something running for a set time after the signal turns off.

Counters

A digital or electromechanical device that registers, tracks, and displays the number of times an event or electrical pulse occurs.

Programmable Logic Controllers (PLC)

A ruggedized, industrial digital computer designed to withstand harsh environments like extreme dust, moisture, heat, and vibration to control manufacturing processes.

Microcontroller (MCU)

A compact, low-cost integrated circuit containing a processor core, memory, and programmable input/output peripherals on a single chip, such as the $ATmega328$ on an Arduino.

Microprocessor Units (MPU)

A powerful, complex processing chip designed for heavy computation that requires external memory and peripherals to function.

Communication Modules

Hardware add-ons that allow automated systems to transmit data wirelessly over local networks or cellular networks.

Wi-Fi

A communication module allowing automated systems to transmit data over local networks.

GSM

A communication module providing cellular network connectivity for remote monitoring and transmitting text alerts over long distances, such as $10\,miles$.

IoT (Internet of Things)

The integration of systems through communication modules that enable remote monitoring, cloud data logging, and long-distance wireless commands.

The Golden Rule of Automation

The principle that over-engineering a system adds unnecessary cost and complexity, while under-engineering leads to catastrophic system failures.

The $6$ Essential Control Devices

Relays, Timers, Counters, PLCs, MCUs/MPUs, and Communication Modules.