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A programmable logic controller or PLC controller is a digital computer used for automation of typically industrial electromechanical processes. PLC programs are typically written in a special application on a personal computer, then downloaded by a direct-connection cable or over a network to the PLC. The program is stored in the PLC either in battery-backedup RAM or some other non-volatile flash memory. Often, a single PLC can be programmed to replace thousands of relays. Under the IEC 61131-3 standard, PLCs can be programmed using standards-based programming languages. A graphical programming notation called Sequential Function Charts is available on certain programmable controllers.

PLC in Car Park Ventilation keeps a check on the activity happening around the area in which the fans and sensors are installed. In case of fire the CO Sensors detect and send a message to the PLC which in turn immediately commands the Jet Fans and Smoke Spill Fans to run at the highest speed to extract smoke from the area it is installed in making it highly effective in case of fires.