ABB PE1364B

咨詢熱線--17750626260　

PLC是采用“順序掃描，不斷循環(huán)”的方式進(jìn)行工作的。即在PLC運(yùn)行時(shí)，CPU根據(jù)用戶按控制要求編制好并存于用戶存儲(chǔ)器中的程序，按指令步序號(hào)（或地址號(hào)）作周期性循環(huán)掃描，如無跳轉(zhuǎn)指令，則從條指令開始逐條順序執(zhí)行用戶程序，直至程序結(jié)束。然后重新返回條指令，開始下一輪新的掃描。在每次掃描過程中，還要完成對(duì)輸入信號(hào)的采樣和對(duì)輸出狀態(tài)的刷新等工作。

PLC的一個(gè)掃描周期必經(jīng)輸入采樣、程序執(zhí)行和輸出刷新三個(gè)階段。

PLC在輸入采樣階段：首先以掃描方式按順序?qū)⑺袝捍嬖谳斎腈i存器中的輸入端子的通斷狀態(tài)或輸入數(shù)據(jù)讀入，并將其寫入各對(duì)應(yīng)的輸入狀態(tài)寄存器中，即刷新輸入。隨即關(guān)閉輸入端口，進(jìn)入程序執(zhí)行階段。

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TELEMECANIQUE 24VDC COIL integral 18 SELF-PROTECTED STARTER LB1LB03P05 LD1LB030
 
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AEG SH04 24VDC COIL MINI RELAY 910-302-056-00
 
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TELEMECANIQUE OVERLOAD RELAY LR2 D3361
 
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AEG MODICON BLANG CARD MODULE NUL 200 4130-042.244865
 
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SCHNEIDER MODICON TSX PREMUIM 24VDC OUTPUT MODULE TSXDSY08T22
 
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TELEMECANIQUE 690VAC MAX MOTOR STARTER LB1 LB039
 
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MODICON JC SYSTEMS REV. B 1007-100-01B PC BOARD 100-0299
 
TELEMECANIQUE OVERLOAD RELAY LR2 D1307 *LOT OF 2*
 
AEG SCHNEIDER MODICON TSX COMPACT ANALOG OUTPUT MODULE DAU 202 6728-042.244666
 
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