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立即聯(lián)系:Tricon 9753-110F 電壓輸入端子面板 Triconex
PLC的數(shù)字量輸入接口并不復(fù)雜，PLC為了提高抗干擾能力，輸入接口都采用光電耦合器來隔離輸入信號與內(nèi)部處理電路的傳輸。因此，輸入端的信號只是驅(qū)動光電耦合器的內(nèi)部LED-導(dǎo)通，被光電耦合器的光電管接收，即可使外部輸入信號可靠傳輸。
目前PLC數(shù)字量輸入端口一般分單端共點(diǎn)與雙端劫入，由于有區(qū)別，用戶在選配外部傳感器時(shí)接法上需要一定的區(qū)分與了解才能正確使用傳感器與PLC為后期的編程工作和系統(tǒng)穩(wěn)定奠定基礎(chǔ)。
輸入電路的形式
1、輸入類型的分類
PLC的數(shù)字顯輸入端子，按電源分直流與交流，按輸入接口分類由單端共點(diǎn)輸入與雙端輸入，單姥共點(diǎn)接電源正極為SINK(sink Current 拉電流)，單謊共點(diǎn)接電源負(fù)極為SRCE(source current灌電流)。
2、詞語的概述
SINK漏型為電流從蝙入端流出，那么輸入端與電源負(fù)極相連即可，說明接口內(nèi)部的光電耦合器為單謊共點(diǎn)為電源正極，可接NPN型傳感器。SOURCE源型為電流從輸入端流進(jìn)，那么輸入端與電源正極相連即可，說明接口內(nèi)部的光電耦合器為單謊共點(diǎn)為電源負(fù)極，可接PNP型傳感器。搜丘開關(guān)與光電開關(guān)三、四線輸出分NPN與PNP輸出，對于無檢測信號時(shí)NPN的接近開關(guān)與光電開關(guān)輸出為高電平(對內(nèi)部有上拉電阻而言)，當(dāng)有檢測信號，內(nèi)部NPN管導(dǎo)通，開關(guān)輸出為低電平。
對于無檢測信號時(shí)PNP的接近開關(guān)與光電開關(guān)輸出為低電平(對內(nèi)部有下拉電阻而言)，當(dāng)有檢測信號，內(nèi)部PNP管導(dǎo)通，開關(guān)輸出為高電平。以上的情況只是針對，專感器是屬于常開的狀態(tài)下。
3、按電源配胃類型
(1)直流輸入電路
如圖1，直流輸入電路要求外部輸入信號的元件為無源的干接點(diǎn)或直流有源的無觸點(diǎn)開關(guān)接點(diǎn)，當(dāng)外部給入元件與電源正極導(dǎo)通，電流通過R1，光電耦合器內(nèi)部LED，VD1(接口指示)到COM端形成回路，光電耦合器內(nèi)部接收管接受外部元件導(dǎo)通的信號，傳輸?shù)絻?nèi)部處理這種由直流電提供電源的接口方式，叫直流輸入電路;
直流電可以由FPLC內(nèi)部提供也可以外接直流電源提供給外部輸入信號的元件。R2在電路中的作用是旁路光電耦合器內(nèi)部LED的電流，保證光電耦合器LED不被兩線制接近開關(guān)的靜態(tài)泄漏電流導(dǎo)通。
(2)交流輸入電路
如圖2，交流輸入電路要求外部輸入信號的元件為無源的干接點(diǎn)或交流有源的無觸點(diǎn)開關(guān)接點(diǎn)，它與直流接口的區(qū)分在光電耦合器前加一級降壓電路與橋整流電路。外部元件與交流電接通后，電流通過R1，C2經(jīng)過橋整流，變成降壓后的直流電，后續(xù)電路的原理與直流的一致。
交流PLC主要適用相對環(huán)境惡劣，布線技改變動不大等場合;如接近開關(guān)就用交流兩線直接替代原來行程開關(guān)。
details
Contact :Tricon 9753-110F Voltage input Terminal Panel Triconex
PLC digital input interface is not complicated, PLC in order to improve anti-interference ability, the input interface adopts photoelectric coupler to isolate the transmission of the input signal and the internal processing circuit. Therefore, the input signal only drives the internal LED-conduction of the photocoupler, and is received by the phototube of the photocoupler, so that the external input signal can be reliably transmitted.
At present, the PLC digital input port is generally divided into single-ended common point and double-ended hijack, because of the difference, the user needs to distinguish and understand the connection method when selecting the external sensor in order to correctly use the sensor and PLC for the later programming work and system stability to lay the foundation.
Form of input circuit
1. Classification of input types
PLC digital display input terminals are divided into DC and AC according to the power supply, and are classified by single-ended common input and double-ended input according to the input interface. The single-pole common point power supply is positively SINK(sink Current), and the single-pole common point power supply is negatively SRCE(source current).
2. Overview of words
SINK drain means that the current flows from the input end, then the input end can be connected to the negative terminal of the power supply, indicating that the photoelectric coupler inside the interface is a single lie common point is the positive terminal of the power supply, and can be connected to the NPN type sensor. SOURCE indicates that the current flows from the input end, then the input end is connected to the positive terminal of the power supply, indicating that the photoelectric coupler inside the interface is a single lie common point is the negative terminal of the power supply, and can be connected to the PNP sensor. The three and four wire outputs of the search switch and the photoelectric switch are divided into NPN and PNP outputs. When there is no detection signal, the NPN proximity switch and the photoelectric switch output is high (for the internal pull-up resistance). When there is a detection signal, the internal NPN tube is on, and the switch output is low.
When there is no detection signal, the output of the PNP proximity switch and the photoelectric switch is low (for the pull-down resistance inside). When there is a detection signal, the internal PNP tube is on, and the switch output is high. The above situation is only for the specific sensor is normally open state.
3, according to the power supply with stomach type
(1) DC input circuit
As shown in Figure 1, the DC input circuit requires the component of the external input signal to be a passive dry contact or a DC active contactless switch contact. When the external input component is connected to the positive electrode of the power supply, the current passes through R1, the internal LED of the photocoupler, and VD1(interface indication) to the COM end to form a loop, and the internal receiving tube of the photocoupler receives the signal of the external component. Transmission to the internal processing of this interface mode provided by direct current power supply, called DC input circuit;
Direct current can be supplied from inside the FPLC or from an external DC power supply to an external input signal element. The function of R2 in the circuit is to bypass the current of the LED inside the photocoupler to ensure that the photocoupler LED is not switched on by the static leakage current of the two-wire proximity switch.
(2) AC input circuit
As shown in Figure 2, the AC input circuit requires the component of the external input signal to be a passive dry contact or an AC active contactless switching contact, which is differentiated from the DC interface by adding a step-down circuit and a bridge rectifier circuit in front of the photoelectric coupler. After the external component is connected with AC, the current passes through R1 and C2 through the bridge rectification, and becomes direct current after voltage reduction, and the principle of the subsequent circuit is consistent with that of DC.
Ac PLC is mainly applicable to the relatively harsh environment, wiring technical changes are not big occasions; If the approach switch is used, the AC two lines directly replace the original travel switch.
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