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抗干擾與外部互鎖 
當(dāng)I/O單元與感性負(fù)載相連時(shí)，一定要在負(fù)載兩端設(shè)置一個(gè)浪涌抑制器或一個(gè)二極管，以吸收負(fù)載產(chǎn)生的反電勢(shì)，如圖1所示。當(dāng)PLC的負(fù)載很可能產(chǎn)生較大的電磁干擾時(shí)，要采取必要的抗干擾措施。如果裝置可能造成1 200V以上的干擾（如電磁繼電器或電磁網(wǎng)等），就需要設(shè)置干擾抑制器。如果干擾源是交流，可在負(fù)載兩端并聯(lián)一個(gè)二極管。當(dāng)CPU機(jī)架與I/O擴(kuò)展機(jī)架安裝在同一底座上時(shí)，底座要可靠接地以提高系統(tǒng)的抗干擾性能。

：張亮（工程師）    專(zhuān)線：
24小時(shí)移動(dòng)專(zhuān)線：         【】

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