What is a PLC?
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What is a PLC?

PLC Definition Programmable Logic Controllers (PLC) are often defined as miniature industrial computers that contain hardware and software used to perform control functions. More specifically, a PLC would be used for the automation of industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or food processing. They are designed for multiple…
History of the PLC
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History of the PLC

The PLC or Programmable Logic Controller has revolutionized the automation industry. Today PLCs can be found in everything from factory equipment to vending machines, but prior to New Year’s Day 1968 the programmable controller didn’t even exist. Instead what existed was a unique set of challenges that needed a solution. In order to understand the…
Ladder Logic in Action
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Ladder Logic in Action

Ladder logic programming for industrial controllers has evolved significantly over the past 30 years, and now supports advanced functionality such as process control, motion control, data manipulation, networking, and data acquisition. However, when you start with a blank page to design a new control system, large or small, there are many basic functions this tried-and-true…
PLC Communications - Coming of Age
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PLC Communications - Coming of Age

PLC communications has grown and changed over the many years since the controller’s inception decades ago. Industrial needs and technological advances have kept PLC communications evolving, and this post will explore some past and present communication standards, and what the future may hold. PLC Partners in Communications PLCs need to communicate to a number of different…
EtherNet/IP: Implicit vs. Explicit Messaging
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EtherNet/IP: Implicit vs. Explicit Messaging

EtherNet/IP is younger than you and me, but still approaching maturity as it just reached its 15th birthday. Over the years, it has grown into an impressive industrial Ethernet communication network for connecting automation equipment, processes and machines. Keys to its success are the network and transport layers where explicit and implicit messaging takes place;…