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Programmable Logic Controller (PLC) has been initiated by a group of engineers used the General Motor Company in 1968 where the system has many advantages.
1.) Easy to PLC Programs
and Modify it easily.
2.) Easy for maintenance, fixture Using nature as a Plug-in module.
3.) System reliableness and smaller device size compared with the relay system.
4.) Cost less equated with relays.
Such advantages of the PLC Programs
system of far flung interest . Requirement of PLC features increased significantly . Technologies in this field has been getting rapidly. From basic logic circuits has become a simple command. As well as to develop and include. counter, timer, shift registers, advance mathematical add on of the Hardware subdivision of the structure has been evolved as a memory with large number of input-output that much.
Later, around 1976 have been fabricated devices Remote I O rack, a device that supports the use of the I O distant several hundred meters from the main PLC Programs.
Around year 1977. the fellowship Allan-Bradley Corporation has espousal of microprocessor 8080, applications from the PLC has been grown and are available to many degrees of her contemporaries . MF 1980 has begun . Evolution Interigent I O and increase the ability to communicate.
Also in the rung Sen Pat has more modules, such as Analog I O, PID control, communications, graphic display, add on I O, extra memory, etc..
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