PLC Or Programmable Logic Controller

PLC is designed to replace a circuit relay sequential in a control system. In addition to programmable, this tool can also be controlled, and operated by people who do not have knowledge in computer operation in particular.

PLC stands for programmable logic controller, which has the following meaning:

1.Programmable

demonstrate ability in terms of memory to store programs that have been made that easily altered function or usefulness.

2.Logic

demonstrate the ability to process input in the arithmetic and logic (ALU), which compares the operation, add, multiply, divide, subtract, negation, AND, OR, and so forth.

3.Controller

demonstrate the ability to control and manage the process to produce the desired output.

The basic elements of a PLC consists of a Power supply, Programming Console, Memory, CPU, input modules, output modules. following we describe each of these elements.

Power supply is used to provide power supply to all parts of the PLC (including CPU, memory, etc.). Most PLC work on the power supply 24 VDC or 220 VAC.

Programming Console is a programming panel in which there RAM (Random Access Memory) that functions as a semi-permanent storage in a program that was created or modified. Programs written to the console must be in the form of mnemonic. This device can be connected directly to the CPU by using a cable that can be installed ekstention and removed at any time.

Memory is a component for storing the program, To the PLC will work as expected then needed a program to run it. The program should be stored in a certain way so that the PLC can access commands according to the instructions. One also needed to store data temporarily during the implementation of the program.

CPU (Central Processing Unit) is the central data processor and controller of the entire work system PLC. Process conducted by the CPU and other international control of all operations, cultivate existing programs in the memory, as well as manage communications between the input-output, memory and the CPU through the BUS system. CPU also serves to execute and process the functions desired by the program that have been determined.

Input module functions to receive signals from sensors peripheral units, and provides signal settings, termination, isolation, and input signal condition indicator. The signals from peripheral devices will be scanned and it will be communicated through the interface module in the PLC.

The output module activates a variety of devices such as hydraulic actuators, pneumatic, solenoid, starter motor, and display the status of peripheral points are connected in the system. Other output module functions include conditioning, termination and also isolating the signals exist. Activation process is of course done by sending signals to discrete and analog relevant, based on his own character which is a PLC digital devices.

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