當(dāng)PLC運(yùn)行時(shí)，是通過(guò)執(zhí)行反映控制要求的用戶程序來(lái)完成控制任務(wù)的，需要執(zhí)行眾多的操作，但CPU不可能同時(shí)去執(zhí)行多個(gè)操作，它只能按分時(shí)操作（串行工作）方式，每一次執(zhí)行一個(gè)操作，按順序逐個(gè)執(zhí)行。由于CPU的運(yùn)算處理速度很快，所以從宏觀上來(lái)看，PLC外部出現(xiàn)的結(jié)果似乎是同時(shí)（并行）完成的。這種串行工作過(guò)程稱為PLC的掃描工作方式。

用掃描工作方式執(zhí)行用戶程序時(shí)，掃描是從條程序開(kāi)始，在無(wú)中斷或跳轉(zhuǎn)控制的情況下，按程序存儲(chǔ)順序的先后，逐條執(zhí)行用戶程序，直到程序結(jié)束。然后再?gòu)念^開(kāi)始掃描執(zhí)行，周而復(fù)始重復(fù)運(yùn)行。

【誠(chéng)信經(jīng)營(yíng)】【質(zhì)量可靠】【進(jìn)口原裝】【拆包防偽】

【超大庫(kù)存】【當(dāng)天付款】【順豐速運(yùn)】【歡迎搶購(gòu)】

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廈門(mén)莫格電氣自動(dòng)化有限公司

張芳（銷(xiāo)售工程師）

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PIAB -70KPA VACUUM SWITCH NIB 3116088

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BANNER PLASTIC FIBER OPTIC CABLE PBF26U NIB

RDP SENSOR RDP4100-138P-T 102577

NAMCO EE280-92140 CYLINDICATOR SENSOR, NNB

IFM ELECTRONIC PHOTOELECTRIC SENSOR 0GE500

COOPER INSTRUMENTS AC POWERED SIGNAL CONDITIONER BRIDGE SENSOR DCM 433

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DELPHI OXYGEN SENSOR ES10732 NIB

PEPPERL + FUCHS * PROXIMITY SENSOR NIB * 094310

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BANNER REMOTE SENSOR SP100E

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PRINTRONIX PAPER MOTION SENSOR 108616-901

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BANNER 27190 PHOTOELECTRIC DC POWER BLOCK OPBTEQDH

CTC PROTECTION & RELIABILITY OPTIMZATION INSTRUMENT SC203100A002IR0?1001K

DELPHI SS10484 SPEED SENSOR, NIB

BANNER MAXI-BEAM SENSOR MODEL RSBF

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