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3. Special functions
These are functions that go beyond Boolean processing, and are linked to a specific sector of activity (e.g. control, machine vision), hence the name "business functions". At a minimum, they take the form of function blocks in FBD language, sometimes in the form of programs, procedures and even processing languages, and sometimes in the form of specific modules in boxes or boards. These modules not only provide a link with the outside world, but also take on part of the processing, thus relieving the load on the processor and improving performance. To do this, they need to include a specific processor or specialized wired electronics.
3.1 Control
It was one of the first extensions of the "basic" PLC, especially as in its most elementary form (found in heating...
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Bibliography
Websites
École d'ingénieurs du Canton de Vaud (consulted March 2010)
GEEA (consulted February 2010)
http://www.geea.org/IMG/pdf/LES_AUTOMATES_PROGRAMMABLES_INDUSTRIELS_pour_GEEA.pdf
...Standards and norms
- UTE Automates programmables : éditée et diffusée par l'Union Technique de l'Électricité (reprend la CEI 1131 ; en anglais). - NF EN 61131 -
- Part 1: General information – It specifies program input, testing, supervision and operating system functions. - NF EN 61131-1 - (décembre 2004)
- Part 2: Equipment specifications and testing – This document specifies the requirements and associated tests for programmable...
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Allen Bradley – Rockwell Automation
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Matsushita – Panasonic
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