Programmable Logic Controllers

968 Words4 Pages
Programmable Logical Controllers A programmable logical controller (PLC) is a computer based controller that can be easily be programmed for a number of different functions. In today’s age of technology, PLCs usually take the form of microprocessors and can be programmed for a number of functions including: timing functions, logic, sequencing, and counting. These functions can be applied to a number of different fields but they are usually implemented for automating manufacturing processes and help maintain balance. According to Mikkor and Roosimolder (2004),” Modern machinery consists of both mechanical and electronic parts. Overall functionality is determined by balance between these components. Initial planning and solution selection plays critical role in final result”. A programmable logical controller is made for such balance due to its flexibility and memory. The first PLC was designed by engineers at General Motors in the late 1960s and since then they have been an integral part of automobile assembly lines. PLCs were preferred over the old relay controllers due to their adaptive nature since switching a PLC from one task to another only requires entering different directions or basic program rewriting instead of having to undertake the task to physically rewire complex machinery. Due to their computer-based nature, programmable logical controllers have large memories that can store a variety of functions that can easily be implemented even by individuals who are unfamiliar with programming languages and procedures. The random access memory (RAM) employed in PLCs allows for a number of different operations to be performed and seamlessly transition to by a single device which was previously impractical. Furthermore, they offer advantages such as ease of programming, employees can be easily trained to use them, increased cost efficiency, and they

More about Programmable Logic Controllers

Open Document