It was from the automotive industry in the USA that the PLC was born. Before the PLC, control, sequencing, and safety interlock logic for manufacturing automobiles was mainly composed of relays, cam timers, drum sequencers, and dedicated closed-loop controllers. Since these could number in the hundreds or even thousands, the process for updating such facilities for the yearly model change-over was very time consuming and expensive, as electricians needed to individually rewire the relays to change their operational characteristics.
Starting in 1958, various systems based on solid-state[27][28] digital logic modules for hard-wired programmed logic controllers (the predecessors of programmable logic controllers (PLC)) emerged to replace electro-mechanical relay logic in industrial control systems for process control and automation, including early Telefunken/AEG Logistat, Siemens Simatic (de), Philips/Mullard/Valvo (de) Norbit, BBC Sigmatronic, ACEC Logacec, Akkord (de) Estacord, Krone Mibakron, Bistat, Datapac, Norlog, SSR, or Procontic systems.[27][29][30][31][32][33]

Currently, the relative anxiety about automation reflected in opinion polls seems to correlate closely with the strength of organized labor in that region or nation. For example, while a recent study by the Pew Research Center indicated that 72% of Americans are worried about increasing automation in the workplace, 80% of Swedes see automation and artificial intelligence as a good thing, due to the country’s still-powerful unions and a more robust national safety net.[47]

Tout d'abord, qu'est-ce que ZennoPoster ? Le programme ZennoPoster est un nouveau logiciel russe qui a été conçu par ZennoLab et a été développé spécialement pour les webmasters (en particulier les experts en référencement) ; y compris ceux qui sont vraiment dans des activités dynamiques sur Internet qui impliquent de travailler dans divers domaines de l'optimisation pour les moteurs de recherche (SEO). ZennoPoster peut également être utilisé facilement par ceux qui ont des connaissances de base en programmation et est fortement recommandé pour le répertoire de n'importe quel programmeur professionnel. Donc, si vous pensez que vous êtes l'une de ces personnes, lisez ce qui suit.