1747-NP1+++1747-NP1
在編寫PLC程序之前,首先應(yīng)對系統(tǒng)的特點(diǎn)和運(yùn)行過程進(jìn)行分析。在一般的工業(yè)生產(chǎn)過程中,系統(tǒng)內(nèi)每臺設(shè)備開始時均處于初始狀態(tài)。初始狀態(tài)包括:
a.供設(shè)備用電的電源正常。
b.設(shè)備選擇在自動方式,即PLC控制方式。
c.該設(shè)備的保護(hù)、控制及信號已復(fù)位。
【公 司】: 廈門泰尼電氣有限公司
【主 營】: AB、GE、施耐德等各類PLC產(chǎn)品
【價 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機(jī)】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
在確定每臺設(shè)備均滿足初始狀態(tài)后,由操作員下達(dá)起動命令,整個系統(tǒng)從初始狀態(tài)出發(fā)進(jìn)入起動過程。自檢中任一臺設(shè)備不滿足起動的初始條件均不能進(jìn)行起動操作。在起動過程中各設(shè)備狀態(tài)不斷改變,各個單體設(shè)備根據(jù)工藝流程順序起動運(yùn)行,向穩(wěn)定運(yùn)行狀態(tài)前進(jìn),最后進(jìn)入穩(wěn)定運(yùn)行狀態(tài)。穩(wěn)定運(yùn)行狀態(tài)的時間視生產(chǎn)情況確定。當(dāng)一段生產(chǎn)工作完成后,由操作員操作或由停車條件自動發(fā)出停車命令,系統(tǒng)即進(jìn)入停止過程,待最后一臺設(shè)備停止完畢后,整個系統(tǒng)又回到了初始狀態(tài),等待下一周期。
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