The difference between PLC and PLD before and their contact - - programmable logic

Programmable controller is a member of the family computer, is designed for industrial control application. Early programmable controller called programmable logic controller, hereinafter referred to as PLC, it mainly used instead of relay realize logic control. With the development of technology, the device functionality is considerably more than the scope of logic control, therefore, today the device called the programmable controller, hereinafter referred to as PC. But in order to avoid confused with short for personal computers, so will be referred to as PLC programmable controller.

one, the main characteristic of PLC

1, high reliability; 2, the rich I/O interface module; 3, USES the modular structure; 4, programming, easy to learn; 5, simple installation, convenient maintenance

2, the function of PLC

1, logic control; 2, timing control; 3, counting control; Step (4, Order) Control; 5, PID control; 6, data control, PLC controller data processing ability. ; 7, communications and networking; 8, other: PLC controller has many special function module, suitable for all kinds of special control requirements, such as: positioning control module, the CRT module.

PLD is programmable logic devices ( ProgramableLogicDevice) Short, the FPGA is field programmable gate array (FPGA) ( FieldProgramableGateArray） Short, both the function of the basic same, just a slightly different principle, so we can ignore the difference sometimes, collectively known as programmable logic devices and PLD/FPGA.

PLD is the most dynamic and promising in the field of electronic design of a technology, its influence is no less invention and use of single-chip microcomputer in the 70 s. PLD do? Can literally speaking, PLD can accomplish the function of any digital device, up to the high performance CPU, 74 down to a simple circuit, can use PLD to implement.

PLD as a blank sheet of paper or a stacking wood, engineers can through the traditional principle diagram input method, or the freedom of the hardware description language to design a digital system. Through software simulation, we can in advance to prove the validity of the design. The PCB is complete, can also be used to on-line modification ability of PLD, modified at any time without having to change the hardware circuit design. Use PLD to develop digital circuit, can greatly shorten the design time and reduce the PCB area, improve the reliability of the system.

typical PLD by a door 'and' and a 'or' gate array (fpga), and any combinational logic can be used with a 'or' expression to describe, so PLD can complete a lot of in the form of product and combinational logic functions. This stage of the main products are PAL ( Programmable logic array) And GAL ( General array logic) 。

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