[introduction] PLC (Programmable Logic Controller, can make up programmed control to make logistic controller) it is a foundation with microprocessor, the new-style industry control equipment of shirt-sleeve computer technology, automation technology and communication technology, the function such as control of the couplet network news report in realizing industrial automation to control, interactive, process, logistic process designing, have an operation the characteristic such as simple, reliable stability.

What is PLC?

PLC (Programmable Logic Controller, can make up programmed control to make logistic controller) it is a foundation with microprocessor, the new-style industry control equipment of shirt-sleeve computer technology, automation technology and communication technology, the function such as control of the couplet network news report in realizing industrial automation to control, interactive, process, logistic process designing, have an operation the characteristic such as simple, reliable stability. PLC controls a system to wait for a part to comprise by module of interface of processor, memory, I/O, communication, peripheral equipment. Differ with the general purpose computer, PLC special design is used at a variety of inputs and output to arrange, patulous temperature limits, immunity is electric noise and fight vibration and concussion. Normally memory is in the process that controls machine operation to equipment report supports or be not in breaking sexual memory easily. PLC is an example of system of good real time, because must be in,have inside answer input condition and produce output result, can cause accident operation otherwise. Following plan institute are shown, it is system of factory automation control, PLC basically is the control layer in whole system.

The main structure of PLC?

Next graphs gave out the functional module that basically includes in the structure of PLC.

1.Processor, the cerebra of PLC, executive program controls an input to output.
2.  Power source module, realize changeover of 110V/230V AC power source, give all functional module on PLC partial power supply.
3.Imitate inputs module (AI) , receive imitate to measure an input and change into digital signal to give CPU.
4.Imitate outputs module (AO) , measure the instruction changeover of CPU output into imitate.
5.The number inputs module (DI) , receive a number to measure an input and change into digital signal to give CPU.
6.The number outputs module (DO) , measure the instruction changeover of CPU output into the number.

The classification of PLC?

Check the number of small-sized PLC I/O 256 bits the following

Bulk small, price low, function is given priority to with switch capacity control, relatively onefold. Apply to equipment of control only station or product of development Electromechanical unifinication. Market admittance doorsill is low, the product is coessential change serious, homebred change rate taller, basically face OEM market.

256 bits of ~2048 order check the number of medium-sized PLC I/O

On foundation of small-sized PLC function, have ability of computation of stronger communication function, number and imitate quantity to handle ability. Apply to relatively complex logistic control to produce system and control of serial production process. Technical wall Mou Gao, basically face project market, current and main by foreign manufacturer forestall.

Check the number of large PLC I/O 2048 bits of above

Have computation, control and harmonious function and formidable network structure. Monitoring system uses CRT to show can show dynamic flow. The control that applies to equipment automation, process automation and process supervisory system. Technical camp is tall, basically face project market, current and main by foreign manufacturer forestall.

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