In the context of home and industrial automation, the term PLC is always linked. What is a PLC? It is the abbreviated form of programmable logic controller. It is a digital computer used for electrically controlling and managing mechanical components and activities electrically. PLC is different from a desktop computer in terms of the multiple inputs and outputs it comes with besides operating under extended temperature ranges.
More reasons why PLC is used in industrial automation is its resistance to vibration and impact and immunity to electrical noise. This digital computer either comes with non-volatile memory or options of storing the programs in battery-backed memory. Yes a PLC can do numerous tasks at a moment – a device synonymous to quick response and enhanced productivity! It is an integral part of industrial automation today irrespective of whether it is control of factory assembly lines, machines, power consumption or automation of electrical activities at home and commercial properties, security systems, and the list goes on.
To control activities, the PLC comes equipped with software and hardware, viz. input / output interface system (information providers and controllable devices) and the central processing unit (CPU). The CPU contains the memory system and the processor, both components controlling all PLC activities. Field devices like sensors, switches, connectors, etc. are connected to the input/output system, which act as the interface between the system and the CPU.
MODICON was the first PLC device introduced in 1968 by Bedford Associates for General Motors (GM). Since then myriad developments took place with time. Today’s PLC is highly advanced, coming with a whole range of special features that can be configured to specific home and industrial automation requirements.
Programming languages and communications capabilities are the essence of a PLC. They differ according to the type of functions. Ladder logic is the language generally used; this programming language strongly resembles a relay-based wiring schematic. Prior to operation, the languages are entered into the CPU's memory.
MODICON was the first PLC device introduced in 1968 by Bedford Associates for General Motors (GM). Since then myriad developments took place with time. Today’s PLC is highly advanced, coming with a whole range of special features that can be configured to specific home and industrial automation requirements.
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