
Introduction to PLC’s
Programmable Logic Controllers
Bedford Associates, founded by Richard Morley introduced the first Programmable Logic Controller in 1968. This PLC was known as the Modular Digital Controller from which the MODICON company derived its name. The History of the PLC as told to Howard Hendricks by Dick Morley provides an interesting insight into the early development of the PLC.
Schnieder Quantum PLC
Programmable Logic Controllers were developed to provide a replacement for large relay based control panels. These systems were inflexible requiring major rewiring or replacement whenever the control sequence was to be changed.
The development of the micro processor from the mid 1970′s have allowed Programmable Logic Read More




March 7th, 2011
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