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◆產(chǎn)品基本信息：TRICON 3625C1 可編程數(shù)字輸出模塊英維思卡件 采用性能優(yōu)良的電源，抑制電網(wǎng)引入的干擾

在PLC控制系統(tǒng)中，電源占有極重要的地位。電網(wǎng)干擾串入PLC控制系統(tǒng)主要通過PLC系統(tǒng)的供電電源(如電源、V/O電源等)、變送器供電電源和與PLC系統(tǒng)具有直接電氣連接的儀表供電電源等耦合進(jìn)入的?，F(xiàn)在，對(duì)于PLC系統(tǒng)供電的電源，一般都采用隔離性能安好電源，而對(duì)于變送器供電的電源和PLC系統(tǒng)有直接電氣連接的儀表的供電電源，并沒受到足夠的重視，雖然采取了一定的隔離措施，但普遍丕不夠，主要是使用的隔離變壓器分布參數(shù)大，抑制干擾能力差，經(jīng)電源耦合而串入共模干擾、差模干擾。所以，對(duì)于變送器和共用信號(hào)儀表供電應(yīng)選擇分布電容小、抑制帶大(如采用多次隔離和屏蔽及漏感技術(shù))的配電器，以減少PLC系統(tǒng)的干擾。

位保證電網(wǎng)饋點(diǎn)不中斷，可采用在線式不間斷供電電源(UPS）供電，提高供電的安全可靠性。并且UPS還具有較強(qiáng)的干擾隔離性能，是一種PLC控制系統(tǒng)的理想電源。

2電纜選擇的敖設(shè)

為了減少動(dòng)力電纜輻射電磁干擾，尤其是變頻裝置饋電電纜。筆者在某工程中，采用了銅帶鎧裝屏蔽電力電纜，從而降低了動(dòng)力線生產(chǎn)的電磁干擾，i該工程投產(chǎn)后取得了滿意的效果。

不同類型的信號(hào)分別由不同電纜傳輸，信號(hào)電繞應(yīng)按傳輸信號(hào)種類分層敖設(shè)，嚴(yán)禁用同一電纜的不同導(dǎo)線同時(shí)傳送動(dòng)力電源和信號(hào)，避免信號(hào)線與動(dòng)力電纜靠近平行敖設(shè)，以減少電磁干擾。

3硬件濾波及軟件抗如果措施

信號(hào)在接入計(jì)算機(jī)前，在信號(hào)線與地間并接電容，以減少共模干擾;在信號(hào)兩極間加裝濾波器可減少差模干擾。

由于電磁干擾的復(fù)雜性，要根本消除迎接干擾影響是不可能的，因此在PLC控制系統(tǒng)的軟件設(shè)計(jì)和組態(tài)時(shí)，還應(yīng)在軟件方面進(jìn)行抗干擾處理，進(jìn)一步提高系統(tǒng)的可靠性。常用的一些措施:數(shù)字濾波和工頻整形采樣，可有效消除周期性干擾;定時(shí)校正參考點(diǎn)電位，并采用動(dòng)態(tài)零點(diǎn)，可有效防止電位漂移;采用信息冗余技術(shù)，設(shè)計(jì)相應(yīng)的軟件標(biāo)志位;采用間接跳轉(zhuǎn)，設(shè)置軟件陷阱等提高軟件結(jié)構(gòu)可靠性。

details

◆ Basic product information: TRICON 3625C1 programmable digital output module Invensys card adopts excellent power supply to suppress the interference introduced by the power grid

In the PLC control system, the power supply occupies a very important position. Power grid interference into the PLC control system mainly through the PLC system's power supply (such as power supply, V/O power supply, etc.), the transmitter power supply and the PLC system with a direct electrical connection of the instrument power supply into the coupling. Now, for the PLC system power supply, generally use good isolation performance power supply, and for the transmitter power supply and PLC system has a direct electrical connection of the instrument power supply, and has not received enough attention, although a certain isolation measures have been taken, but generally not enough, mainly the use of isolation transformer distribution parameters, inhibit interference ability is poor, Common mode interference and differential mode interference are introduced through power coupling. Therefore, for the transmitter and shared signal instrument power supply should choose a small distribution capacitance, large suppression band (such as the use of multiple isolation and shielding and leakage technology) distributor to reduce the interference of the PLC system.

To ensure that the power grid feed point is not interrupted, the online uninterruptible power supply (UPS) can be used to supply power to improve the safety and reliability of power supply. And UPS also has strong interference isolation performance, is an ideal power supply for PLC control system.

2 Cable selection

In order to reduce the power cable radiation electromagnetic interference, especially the frequency conversion device feed cable. In a project, the author used copper tape armouring shielded power cable to reduce the electromagnetic interference of power line production, and achieved satisfactory results after the project was put into operation.

3 Hardware filtering and software anti-failure measures

Before the signal is connected to the computer, a capacitor is connected between the signal line and the ground to reduce the common-mode interference. Differential mode interference can be reduced by adding a filter between the two poles of the signal.

Due to the complexity of electromagnetic interference, it is impossible to fundamentally eliminate the impact of interference, so in the software design and configuration of the PLC control system, anti-interference processing should also be carried out in the software to further improve the reliability of the system. Some commonly used measures: digital filtering and power frequency shaping sampling, can effectively eliminate periodic interference; Time correction of reference point potential and dynamic zero point can effectively prevent potential drift; Using information redundancy technology, the corresponding software flag bits are designed. Indirect jump and software trap are used to improve the reliability of software structure.

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