YASKAWA SGMPH-08AAA2C

?PLC在20世紀(jì)90年代已經(jīng)形成微、小、中、大、巨型多種PLC。按I/O點數(shù)分，可分為微型PLC（32I/O）、小型PLC（256I/O）、中型PLC（1024I/O）、大型PLC（4.69I/O）、巨型PLC（8195I/O）五種。

??? PLC與工業(yè)生產(chǎn)過程的聯(lián)系是通過I/O接口模塊來實現(xiàn)的。PLC有許多I/O接口模塊，包括開關(guān)量輸入模塊、開關(guān)量輸出模塊、模擬量輸入模塊、模擬量輸出模塊以及其他一些特殊模塊，使用時應(yīng)根據(jù)它們的特點進(jìn)行選擇。

????（一）確定I/O點數(shù)

????根據(jù)控制系統(tǒng)的要求確定所需要的I/O點數(shù)時，應(yīng)再增加?10%～20%的備用量，以便隨時增加控制功能。對于一個控制對象，由于采用的控制方法不同或編程水平不同，I/O點數(shù)也應(yīng)有所不同。表2列出了典型傳動設(shè)備及常用電氣元件所需的開關(guān)量的I/O點數(shù)。

（二）開關(guān)量I/O

????開關(guān)量I/O接口可從傳感器和開關(guān)（如按鈕、限位開關(guān)等）及控制設(shè)備（如指示燈、報警器、電動機起動器等）接收信號。典型的交流輸入/輸出信號為24～240V，直流輸入/輸出信號為5～240V。盡管輸入電路因制造廠家不同而不同，但有些特性是相同的，如用于消除錯誤信號的抖動電路等。此外，大多數(shù)輸入電路在高壓電源輸入和接口電路的控制邏輯部分之間都設(shè)有可選的隔離電路。在評估離散輸出時，應(yīng)考慮熔絲、瞬時浪涌保護(hù)和電源與邏輯電路間的隔離電路。熔絲電路也許在開始時花費較多，但可能比在外部安裝熔絲耗資要少。

【誠信經(jīng)營】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】
【超大庫存】【當(dāng)天付款】【順豐速運】【歡迎搶購】
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廈門莫格電氣自動化有限公司
張芳（銷售工程師）
電 ?話：0592-6514182/17750626260
Q ? ?Q：177763184
郵 ?箱：177763184@qq.cm
傳 ?真：0592-6514751
網(wǎng)址：http://www.mogget.cn
誠信經(jīng)營，質(zhì)量為首，誠信至上，莫格電氣竭誠為您服務(wù)！
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