Dec 28, 2009

Basics of PLC


History of PLC
PLC stands for Programmable logic controller and was designed in the year 1960 which was first proposed by Bedford Association of Bedford.The first PLC was named 084 because it was the 84th project of Bedford Association.
At that time a company was started called MODICON which stand for MOdular DIgital CONtroller.MODICON brand was sold in 1977 and at present its owner is Schneider Electric.

Father of PLC: Dick Morley

What is PLC ?
As said above PLC stands for Programmable logic controller and as the name indicate it is a controller which can be programmed through logic's and thus control any machine. PLC were designed to remove mechanical relay,Timer and counter and thus automate the process. and thus provide many advantage over mechanical system.

PLC choosing Criteria
While choosing a PLC we should keep in mind some of the important points. PLC are choosen generally on the basis of some requirement of the company or individual person. Some of the PLC choosing criteria are:
1. Number of IO's.
2.Type of IO's.
3.Memory size of PLC.
4.Compact or Modular.
5.Analog or Digital.
6.Sinking & Sourcing at input and output.
7.PLC Scan Time
8.Number and type of Communication port etc.

Advantage of PLC
Their are lot of Advantage of PLC, some are as follows:-
1.Reliability in operation
2.Flexibility in programming and reprogramming
3.Large number of Contacts available
4.Online/offline Modification
5.Cost effective for complex systems
6.Small physical size
7.Speed in Operation
8.Easy Documentation
9.Security
10.Ease of Maintenance and Troubleshooting

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