Global Automation Systems & technologies is an UAE based automation company. We providing the best training in 20-PLCs 5-SCADAs, 3-DRIVES, 1-OPC, 2-REMOTE I/O & 3-HMI We do give world class training course outlines. In the past humans were the main methods for controlling a system. More recently electricity has been used for control and early electrical control was based on relays. These relays allow power to be switched on and off without a mechanical switch. It is common to use relays to make simple logical control decisions. The development of low cost computer has brought the most recent revolution, the Programmable Logic Controller (PLC). The advent of the PLC began in the 1970s, and has become the most common choice for manufacturing controls. PLCs have been gaining popularity on the factory floor and will probably remain predominantfor some time to come. Most of this is because of the advantages they offer.