：林超

部門 ： 銷售二部

職位：銷售工程師

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 : 2648713398

*處理單元（CPU）是可編程邏輯控制器的控制中樞。它按照可編程邏輯控制器系統(tǒng)程序賦予的功能接收并存儲(chǔ)從編程器鍵入的用戶程序和數(shù)據(jù)；檢查電源、存儲(chǔ)器、I/O以及警戒定時(shí)器的狀態(tài)，并能診斷用戶程序中的語法錯(cuò)誤。當(dāng)可編程邏輯控制器投入運(yùn)行時(shí)，首先它以掃描的方式接收現(xiàn)場各輸入裝置的狀態(tài)和數(shù)據(jù)，并分別存入I/O映象區(qū)，然后從用戶程序存儲(chǔ)器中逐條讀取用戶程序，經(jīng)過命令解釋后按指令的規(guī)定執(zhí)行邏輯或算數(shù)運(yùn)算的結(jié)果送入I/O映象區(qū)或數(shù)據(jù)寄存器內(nèi)。等所有的用戶程序執(zhí)行完畢之后，zui后將I/O映象區(qū)的各輸出狀態(tài)或輸出寄存器內(nèi)的數(shù)據(jù)傳送到相應(yīng)的輸出裝置，如此循環(huán)運(yùn)行，直到停止運(yùn)行。

　　為了進(jìn)一步提高可編程邏輯控制器的可靠性，近年來對大型可編程邏輯控制器還采用雙CPU構(gòu)成冗余系統(tǒng)，或采用三CPU的表決式系統(tǒng)。這樣，即使某個(gè)CPU出現(xiàn)故障，整個(gè)系統(tǒng)仍能正常運(yùn)行。 

1746-NI4

1746-NI8

1746-NR4

1746-NO4V

1747-CP3

1747-DCM

1747-L531

1747-L532/E

1747-L541

1747-L542

1747-L543/B

1747-L551/A

1747-L552/B

1747-L553/B

1747-ASB

1747-SDN

1747-SN/B

1756-IB16/A

1756-IB16I/A

1756-IF16/A

1756-L63XT

1756-IT6I

1756-OB16D

1756-CNB

1756-CNBR/D

1756-CNBR/B

1756-CNBR/E

1756-OF6VI/A

1756-DNB/A/B

1756-ENBT/A

1756-EN2T

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SMC VV816-03S-W04D-?X17-XG 6-STATION PNEUMATIC MANIFOLD

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