公司主營(yíng)進(jìn)口PLC模塊，可編程控制器，伺服控制系統(tǒng)，和DCS備件等，例如：ABB、AB、GE， Bently，F(xiàn)OXBORO. MOTOROLA. XYCOM. HONEYWELL. TRICONEX. SCHNEIDER. REXROTH. YOKOGAWA .KUKA .OVATION .HIMA.等。
ABB086349-002PLC的硬件組成與微型計(jì)算機(jī)相似，其主機(jī)由CPU板、存儲(chǔ)器、輸入／輸出（I／O）接口、電源等幾大部分組成；可配備如編程器、圖形顯示器、通信接口等外部設(shè)備。
CPU也稱處理器，是由一片或幾片大規(guī)模集成電路芯片組成的，相當(dāng)于人的大腦，是PLC的核心部分；ABB086349-002CPU的作用是可通過接口及軟件向系統(tǒng)的各個(gè)部分發(fā)出各種命令，同時(shí)對(duì)被測(cè)參數(shù)進(jìn)行巡回檢測(cè)、數(shù)據(jù)處理、控制運(yùn)算、報(bào)警處理及邏輯判斷等，實(shí)現(xiàn)對(duì)整個(gè)PLC的工作過程進(jìn)行控制；目前大多數(shù)小型PLC都用8位或者16位單片機(jī)作CPU。
I／O接口是輸入（IN）／輸出（OUT）接口的簡(jiǎn)稱，是PLC主機(jī)與被控對(duì)象進(jìn)行信息交換的紐帶；PLC通過I／O接口與外部設(shè)備進(jìn)行數(shù)據(jù)交換，PLC的輸入輸出信號(hào)有開關(guān)量、模擬量、數(shù)字量三種類型，所有的輸入輸出信號(hào)均經(jīng)過光電等隔離，大大增強(qiáng)了PLC的抗干擾能力。
PLC common output form there are several? What are its characteristics?
A: Common output forms are relay output, thyristor (SSR) output, transistor output. The characteristics are: relay output type: CPU drives the relay coil, so that the contact draws, the external power supply through the closed contact to drive the external load, the open leakage current is zero, the response time is slow (about 10ms), can take a large external load; Transistor output type: the CPU through the optical coupling transistor off, to control the external DC load, response time is fast (about 0.2ms), can take the external load is small; Thyristor output type: The CPU makes the tridirectional thyristor off through optical coupling to control the external AC load. The open-circuit leakage current is large and the response time is fast (about 1ms).
1. Switching quantity logic control
Replace the traditional relay circuit, realize logic control, sequence control, can be used for single equipment control, can also be used for multi-machine group control and automation line. Such as injection molding machine, printing press, stapler machine, combination machine tools, grinding machine, packaging production line, electroplating line, etc.
2. Industrial process control
In the process of industrial production, there are some such as temperature, pressure, flow, liquid level and speed and other continuous changes of the amount (that is, the analog amount), PLC uses the corresponding A/D and D/A conversion module and a variety of control algorithms to deal with the analog amount, complete closed-loop control. PID adjustment is a kind of adjustment method used in general closed-loop control system. Process control is widely used in metallurgy, chemical industry, heat treatment, boiler control and so on.
3. Motion control
PLC can be used to control circular motion or linear motion. General use of special motion control module, such as single-axis or multi-axis position control module can drive stepper motor or servo motor, widely used in a variety of machinery, machine tools, robots, elevators and other occasions.
4. Data processing
PLC has mathematical operation (including matrix operation, function operation, logic operation), data transmission, data conversion, sorting, table lookup, bit operation and other functions, can complete the data collection, analysis and processing. Data processing is generally used in some large control systems such as paper, metallurgy and food industries.
5. Communication and networking
PLC communication includes communication among PLC and communication between PLC and other intelligent equipment. With the development of factory automation network, PLC now has communication interface, communication is very convenient.
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