WHAT IS PROGRAMMABLE AUTOMATION CONTROLLERS SYSTEM..?

programmable logic controller (PLC) to the scalable, multidisciplined, and informationenabled programmable automation controller (PAC), we need multiple controllers.
1-LARGE CONTROL SYSTEM
2.SMALL CONTROL SYSTEM
3.MICRO CONTROL SYSTEM.



LARGE CONTROL SYSTEM-

Our large control systems fit your most demanding application needs Enables modular architectures and various I/O and network topologies Delivers powerful control solutions with worldclass capabilities from process to safety to motion Offers reliability and performance for distributed or supervisory CONTROL SYSTEM Applications.

SMALL CONTROL SYSTEM-

Our small control systems offer the features and flexibility you need without the overhead of larger systems.Offers standard and safetycertified controllers in chassisbased, packaged and modular
designs Supports complex machine control, batch processing, and builds automation applications.

MICRO CONTROL SYSTEM-

Our micro control systems provide economica
l solutions for your basic control needs. Connects with straightforward programming tools Includes integrated I/O and communication Provides simple control timing and logic Supports applications such as conveyor automation and standalone machines

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Programming structure for a PLC :-

Programming a PLC :-

In these modern times a PC with specially dedicated software from the PLC manufacturer is used to program a PLC.  The most widely used form of programming is called ladder logic.  Ladder logic uses symbols, instead of words, to emulate the real world relay logic control, which is a relic from the PLC's history. 

These symbols are interconnected by lines to indicate the flow of current through relay like contacts and coils.  Over the years the number of symbols has increased to provide a high level of functionality.
The completed program looks like a ladder but in actuality it represents an electrical circuit.  The left and right rails indicate the positive and ground of a power supply.
The rungs represent the wiring between the different components which in the case of a PLC are all in the virtual world of the CPU.

So if you can understand how basic electrical circuits work then you can understand ladder logic.
In this simplest of examples a digital input (like a button connected to the first position on the card) when it is pressed turns on an output which energizes an indicator light.

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