位置是從零位標記開始計算的脈沖數(shù)量確定的，而型編碼器的位置是由輸出代碼的讀數(shù)確定的。在一圈里，每個位置的輸出代碼的讀數(shù)是的; 因此，當電源斷開時，型編碼器并不與實際的位置分離。如果電源再次接通，那么位置讀數(shù)仍是當前的，有效的; 不像增量編碼器那樣，必須去尋找零位標記。
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現(xiàn)在編碼器的廠家生產(chǎn)的系列都很全，一般都是的，如電梯型編碼器、機床編碼器、伺服電機型編碼器等，并且編碼器都是智能型的，有各種并行接口可以與其它設(shè)備通訊。
編碼器是把角位移或直線位移轉(zhuǎn)換成電信號的一種裝置。前者成為碼盤，后者稱碼尺.按照讀出方式編碼器可以分為接觸式和非接觸式兩種.接觸式采用電刷輸出，一電刷接觸導(dǎo)電區(qū)或絕緣區(qū)來表示代碼的狀態(tài)是"1"還是"0";非接觸式的接受敏感元件是光敏元件或磁敏元件，采用光敏元件時以透光區(qū)和不透光區(qū)來表示代碼的狀態(tài)是"1"還是"0"。
按照工作原理編碼器可分為增量式和式兩類。
