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A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an industrial computer control system that continuously monitors the state of input devices and makes decisions based upon a custom program to control the state of output devices.
Almost any production line, machine function, or process can be greatly improved using this type of control system. However, the biggest benefit in using a PLC is the ability to change and replicate the operation or process while collecting and communicating vital information.
Another advantage of a PLC system is that it is modular. That is, you can mix and match the types of Input and Output devices to best suit your application.
While Ladder Logic is the most commonly used PLC programming language, it is not the only one. The table lists of some of languages that are used to program a PLC.
Ladder Diagram (LD) Traditional ladder logic is graphical programming language. Initially programmed with simple contacts that virtual the opening and closing of transmits, Ladder Logic programming has been expanded to include such functions as counters, timers, shift registers, and math operations.
A programmable logic controller, PLC, or programmable controller is a digital computer used for automation of naturally industrial electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. PLCs are used in many machines, in many industries. PLCs are designed for multiple arrangements of digital and analog inputs and outputs, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. A PLC is an example of a "hard" real-time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result.
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.
Teknocrat’s Academy of Automation and Control Technology (TAACT) providing industrialized training in PLC/ SCADA/ automation engineer courses with placement services.
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Submitted on: 2016-08-18 23:01:37