Of PLCs, control panels, and VFDs

PLCs have come a long way since the late 1960s and their applications in engineering are both innovative and seemingly endless.

08/14/2013


Dick Morley is known as the father of the PLC because of his work at Bedford and Assocs. in 1968. Almost half a century later, the PLC is the mainstay of industrial automation—in one form or another. Whether it’s a brick, micro, or a high-horsepower PAC, the PLC “has been the workhorse in automation and manufacturing industries across the board for many years,” to borrow from the words of the authors of this issue’s cover story. 

High-speed Ethernet allows bandwidth-hungry technology such as motion control and video to communicate with the systems that require their functionality. As the authors point out, “Although PLCs opened the door for on-the-floor visual communication, it was their integration with networking devices that offered manufacturers a new level of visibility and control by combining real-time Ethernet with visualization, control, and communication capabilities.” 

The second article in this issue explains how advancements in modern control panel wiring methods can reduce the costs of manufacturing and ownership. By increasing the number of control panel components as well as simplifying the wiring that connects them, material, labor, and commissioning costs can be minimized, and construction time can be reduced. 

VFDs are among the devices that can interface with PLCs. The third article in this issue explains the history behind the need for bypasses. Although VFDs have become much more reliable than when they were first introduced, the bypass, which enabled users to operate motors without the VFD, remains today in one form or another. This article describes traditional and electronic bypasses as well as redundant VFD configurations.

This article appears in the Applied Automation supplement for Control Engineering and Plant Engineering



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The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers. Vote now (if qualified)!
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The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
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This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
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Salary and Career Survey, IT and OT convergence, robotic standards and safety, secure circuit protection
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Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

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February 2018
Focus on power systems, process safety, electrical and power systems, edge computing in the oil & gas industry
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Product of the Year winners, Pattern recognition, Engineering analytics, Revitalize older pump installations
John O. Ayuk, PE, CFSE, PMP, CAP
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This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
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The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by Control Engineering subscribers. Vote now (if qualified)!
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The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
System Integrator of the Year
Each year, a panel of Control Engineering and Plant Engineering editors and industry expert judges select the System Integrator of the Year Award winners in three categories.
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This eGuide illustrates solutions, applications and benefits of machine vision systems.
Wireless Reliability in Harsh Environments
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
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This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
May 2018
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April 2018
Cybersecurity best practices, artificial intelligence, robotic additive manufacturing, embedded systems, IIoT integration, energy efficiency
March 2018
Digitalization integration, process sensors, edge computing, fog computing, condition monitoring, and motors
Edge Computing
This article collection contains several articles on how today's technologies heap benefits onto an edge-computing architecture such as faster computing, better networking, more memory, smarter analytics, cloud-based intelligence, and lower costs.
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Articles in this digital report highlight technologies that enable Industrial Internet of Things, IIoT-related products and strategies.
PLCs
Programmable logic controllers (PLCs) represent the logic (decision) part of the control loop of sense, decide, and actuate. Featured articles in this digital report compare PLCs and programmable automation controllers (PACs), industrial PCs, and robotic controllers.
SIDB

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

April 2018
ROVs, rigs, and the real time; wellsite valve manifolds; AI on a chip; analytics use for pipelines
February 2018
Focus on power systems, process safety, electrical and power systems, edge computing in the oil & gas industry
December 2017
Product of the Year winners, Pattern recognition, Engineering analytics, Revitalize older pump installations
John O. Ayuk, PE, CFSE, PMP, CAP
Automation Engineer; Wood Group
Doug Baker
System Integrator; Cross Integrated Systems Group
Jose S. Vasquez, Jr.
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Fire & Life Safety Engineer; Technip USA Inc.
Data Centers: Impacts of Climate and Cooling Technology
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
Safety First: Arc Flash 101
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
Critical Power: Hospital Electrical Systems
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
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