Tamil TechZone

Programmable logic controllers Programmable logic controllers (PLCs) have been an integral part of factory automation and industrial process control for decades. PLCs control a wide array of applications from simple lighting functions to environmental systems to chemical processing plants. These systems perform many functions, providing a variety of analog and digital input and output interfaces; signal processing; data conversion; and various communication protocols. All of the PLC's components and functions are centered around the controller, which is programmed for a specific task. The basic PLC module must be sufficiently flexible and configurable to meet the diverse needs of different factories and applications. Input stimuli (either analog or digital) are received from machines, sensors, or process events in the form of voltage or current. The PLC must accurately interpret and convert the stimulus for the CPU which, in turn, defines a set of instru...

PLC is a Robust Industrial computer. Easy to operate, simply runs codes given to it and can handle lots of inputs & outputs. SCADA is a Control, surveillance & automation execution design. It’s a plan of how to set up Industrial automation, a surveillance system to check remote units in a plant & take control if something goes wrong by using surveillance computers which are connected to devices in plant’s units. SCADA has 5 components which speak of elements needed to achieve such a system. They include sensors, alarms(to gain the working state of a unit in the plant),WLAN & LAN, OPC servers(for the purpose of communication between sensors and the surveillance team in control room), PLC(a computer to process signals from various sensors on field and present a simplified information about the unit's status & such), RTUs which are wireless control units, HMI (human machine interfaces where we can check n interact with an interface and man...