GE GPS1BHAL

PLC的主要特點(diǎn)

(一)高可靠性

1.所有的I/O接口電路均采用光電隔離，使工業(yè)現(xiàn)場(chǎng)的外電路與

PLC內(nèi)部電路之間電氣上隔離。

2.各輸入端均采用R-C濾波器，其濾波時(shí)間常數(shù)一般為10~20ms.

3.各模塊均采用屏蔽措施，以防止輻射干擾。

4.采用性能優(yōu)良的開關(guān)電源。

5.對(duì)采用的器件進(jìn)行嚴(yán)格的篩選。

6.良好的自診斷功能，一旦電源或其他軟，硬件發(fā)生異常情況，CPU立即采用有效措施，以防止故障擴(kuò)大。

7.大型PLC還可以采用由雙CPU構(gòu)成冗余系統(tǒng)或有三CPU構(gòu)成表決系統(tǒng),使可靠性更進(jìn)一步提高。

豐富的I/O接口模塊

PLC針對(duì)不同的工業(yè)現(xiàn)場(chǎng)信號(hào)，如:

交流或直流;

開關(guān)量或模擬量; .

電壓或電流;

脈沖或電位;

強(qiáng)電或弱電等。

有相應(yīng)的I/O模塊與工業(yè)現(xiàn)場(chǎng)的器件或設(shè)備，如:

按鈕

行程開關(guān)

接近開關(guān)

傳感器及變送器

電磁線圈

控制閥

直接連接。另外為了提高操作性能，它還有多種人-機(jī)對(duì)話的接口模塊;為了組成工業(yè)局部網(wǎng)絡(luò)，它還有多種通訊聯(lián)網(wǎng)的接口模塊，等等。

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