Need of plc training in today industry scenario

PLC stands for Programmable Logic Controller is a kind of digital device which is fundamentally used for automation purpose. Automation is a process to complete assigned tasks automatically, without any human intervention which can drastically improve the quality and quantity of overall output with a min. percentage of error. PLC’s are mostly used to automate industrial & heavy electromechanically controlled systems. PLC’s are very common to be used in today’s industrial scenario.

PLC’s are designed to work efficiently under both digital and analog input/output systems, can work in variable temperature ranges & can resist electrical noise and impact of vibrations.

Programs are basically stored in non volatile memory which can be re-programmed as per the requirement of control systems. PLC’s are a very good example to understand Real Time input/output responsive system.

Before the invention of PLC’s automated machineries used to integrate many tools such as relays, timer’s, sequencer’s, closed loop controllers etc in a number ranges from few 100’s to millions as per the level of automation required. The technique was very expensive and time consuming. Even during troubleshooting each installed device needed to be thoroughly checked in a sequence.

Afterwards general computers imparted their presence in industrial environment to overcome these issues, early computer systems needs specialist programmers to control operating systems & they must be placed in a clean, protective and monitored environment which do makes difficulties to lie in a practical plant floor conditions. To overcome this issue a request of proposal in the year 1968 is issued to replace hard wired relay systems based on a white paper by Engineer Edward R. Clark.

The first PLC designed and introduced by MODICON in the year 1969 invented by Mr. Dick Morley also known to be as father of PLC’s. Present owner of this company is Schneider Electric.

Early PLC’s are designed to replace relays and programmed on Ladder logic while modern PLC’s can be programmed in a number of ways such as relay-derived ladder logic, programming languages such as BASIC & C, State Logic etc.

Feature: - The main feature of PLC’s compared to computers are that it can armor in several conditions (such as moist, dust, heat etc) and have the facility of extensive I/O arrangements.

PLC’s sometimes needed to be intervened by humans for the purpose of configurations, alarm reporting, or everyday control. A HMI (Human Machine Interface) employed for this purpose. HMI’s are also referred to be as MMI’s (Man Machine Interface) or GUI’s (Graphic user interface) is a kind of simple systems which may use buttons, lights, and alarms to interact with the user. Graphic touch screens and digital displays are also meant to be used. A complex control system may use a computer interface connected with PLC’s via hard wired communication cable.

PLC’s have inbuilt communication ports such as RS-232, EIA-485, Ethernet etc. Communication protocols used are generally MODBUS BAC net and DF-1.

Most modern PLC’s communicate with the network by a SCADA system (Supervisory Control & Data Acquisition) or web browser.

PLC Training: - Due to immense use of automated modern techniques via PLC’s in present industrial environment, there is a huge requirement of PLC Training & trained man force. A user who knows how to handle PLC’s as per the requirement can easily control the installed automated devices. PLC Training broadly includes PLC programming, HMI Training, SCADA Training, motors & drives practical Hands-On Training, instrumentation, digital and analog devices, digital controllers, timer’s & their application specific implementation.

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