9441H276;
9441H276現貨;
9441H276供應。
輸出回路的設計
1、各種輸出方式之間的比較
(1)繼電器輸出:
優點是不同公共點之間可帶不同的交、直流負載,且電壓也可不同,帶負載電流可達2A/點;但繼電器輸出方式不適用于高頻動作的負載,這是由繼電器的壽命決 定的。其壽命隨帶負載電流的增加而減少,一般在幾十萬次至Jl百萬次之間,有的公司產品可達1000萬次以上,響應時間為10ms。
(2)晶閘管輸出:
帶負載能力為0.2A/點,只能帶交流負載,可適應高頻動作,響應時間為1ms。
(3)晶體管輸出:
優點是適應于高頻動作,響應時間短,一般為0.2ms左右,但它只能帶 DC 5—30V的負載,輸出負載電流為0.5A/點,但每4點不得大于0.8A。
當你的系統輸出頻率為每分鐘6次以下時,應繼電器輸出,因其電路設計簡單,抗干擾和帶負載能力強。當頻率為10次/min以下時,既可采用繼電器輸出方式;也可采用PLC輸出驅動達林頓三極管(5—10A),再驅動負載,可大大減小。
15) 奇文共欣賞,疑義相與析。(陶淵明《移居》)
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