The essay, entitled PLC: PROGRAMMABLE LOGIC CONTROLLER, describes the construction projects and the operation of a new system that is completely different from the competition.The heart of this system is centered on a programmable logic chip, mounted on its support card, where the RAM and FRAM memories have subsequently been installed.The programmable semiconductor, already mounted on the support board and memory interconnections, can easily be found on the Internet market at low prices.The chip is programmed by files attached in this essay, subsequently used as a PLC by sending instructions in audio format .wav.This type of programming has the advantage of being managed directly from the Windows operating system without the installation of any specific program.The essay is essentially in multimedia .pdf format, 151 pages, the graphics have been studied in such a way as to be read on smartphone or tabbett, illustrated by numerous high resolution photos.The .pdf file contains the attachment .zip where there are files to program the programmable logic chip, the various tests to improve the circuit blocks to be imported into the chip, the electronic scheme of the chip, the .wav protocols to program the PLC and various examples to make it work.Inside the folder where the tests are inserted to improve the circuit blocks is also the F-RAM programmer, parallel memory.It is recommended that the reader of the .pdf files be able to detect attachments, with the exception of the essay sold in epub format.In the initial part of the essay, in .epub format, the characteristics of the system can be visualized in eight photos, while the part of the complete essay is integrated inside it in pdf format.For the extraction of the essay in .pdf it is not necessary to go for the reading of the epub format, but just rename the extension from .epub to .zip and decompress.After the decompression operation, the .pdf test can be found in the OEBPS folder, Misc subfolder.In the same subfolder there is the file attached to the essay in .rar format.This essay is distributed exclusively in pdf and epub format.Other formats, even if present in this shop, are not absolutely compatible with this essay.FOR INFORMATION.Email address: elettronicastandardfranco@yahoo.comEmail address: mariofrancomail@yahoo.itOfficial page on Facebook: Elettronica Standard Franco.