Programmable Logic Controllers (PLCs) are digital computer specifically designed for automation, machine control and factory assembly line. Techniques are now commonly used in industrial automation. This control unit is different from general purpose computers are primarily designed for multiple inputs and outputs of events. Programming is done via a special computer language, ranging from the ladder logic, IEC 61131-3 standard, Mnemonic Instruction, Sequential Function Charts (SFC), Structured Text (ST), Function Block Diagram (FBD) for Basic or C , which can then be stored in batteries or in a non-volatile memory. The technique allows ladder logic to proceed in a sequential manner, which makes it easy to use even to those who are trained to operate these machines on computer-based. Each program operates according to the subscriber details of the sequence and timing of the procedure to be performed by machine.

In his early years requires automation system used by thousands of different systems of individual relays. Now advanced PLC functionality is now based on microprocessor and is designed for use in real time to replace the control relay, timer, motion control and other complex, making them available in a multi-functioned device. There is also operated through a variable (analog) output device or input as an ON and OFF. Even with the current use of electricity in the relay, can be automatically turned on or off, without any mechanical contact.

Among the many advantages of the PLC very flexible. A machine can now perform multiple functions and control of various programs in a defeat. It ‘s very convenient, since the errors and changes can now be easily changed by changing the circuit design, or sequence. Monitoring is ensured by continuous monitoring of ongoing processes, which makes troubleshooting and maintenance. It ‘also space efficient, since the memory is now bigger and many application systems can be configured in a single PLC. Its duration was also one of its merits, because it can withstand extreme conditions such as heat, dust, humidity and others. It also increases productivity thanks to this expanded system, and operating cost reduction and increased safety for human workers, are among the benefits of PLC.

There are several varieties of PLC that are available on the market today. Since it was created for cars, is still in its current trend in the popularity mainly because of its advantages, multi-functions and the ability to operate in harsh environments. Now there are a number of PLC that fit most if not all equipment you need. Change your installation tutorial and PLC is also offered on the market for those willing to purchase these devices to the system. And ‘comfortable, convenient and easily modified for each user prefers to use special.