大多數(shù)模塊式PLC使用底板或機(jī)架，其作用是：電氣上，實(shí)現(xiàn)各模塊間的，使
CPU能訪問底板上的所有模塊，機(jī)械上，實(shí)現(xiàn)各模塊間的連接，使各模塊構(gòu)成一個(gè)
整體。
(一) 輸入采樣階段
在輸入采樣階段，PLC以掃描方式依次地讀入所有輸入狀態(tài)和數(shù)據(jù)，并將它們存入
I/O映象區(qū)中的相應(yīng)得單元內(nèi)。輸入采樣結(jié)束后，轉(zhuǎn)入用戶程序執(zhí)行和輸出刷新階
段。在這兩個(gè)階段中，即使輸入狀態(tài)和數(shù)據(jù)發(fā)生變化，I/O映象區(qū)中的相應(yīng)單元的
狀態(tài)和數(shù)據(jù)也不會(huì)改變。因此，如果輸入是脈沖信號(hào)，則該脈沖信號(hào)的寬度必須
大于一個(gè)掃描周期，才能保證在任何情況下，該輸入均能被讀入。
(二) 用戶程序執(zhí)行階段
在用戶程序執(zhí)行階段，PLC總是按由上而下的順序依次地掃描用戶程序(梯形圖)。
在掃描每一條梯形圖時(shí)，又總是先掃描梯形圖左邊的由各觸點(diǎn)構(gòu)成的控制線路，
并按先左后右、先上后下的順序?qū)τ捎|點(diǎn)構(gòu)成的控制線路進(jìn)行邏輯運(yùn)算，然后根
據(jù)邏輯運(yùn)算的結(jié)果，刷新該邏輯線圈在系統(tǒng)RAM存儲(chǔ)區(qū)中對(duì)應(yīng)位的狀態(tài)；或者刷新
該輸出線圈在I/O映象區(qū)中對(duì)應(yīng)位的狀態(tài)；或者確定是否要執(zhí)行該梯形圖所規(guī)定的
特殊功能指令。
備貨，備貨，降降降，火火火，火火火……
備貨，備貨，降降降，火火火，火火火……
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公司名稱：廈門泰尼電氣有限公司
：小廖（銷售代表）
：
傳真號(hào)碼：（麻煩備注01008收）
號(hào)碼:
：
誠(chéng)信經(jīng)營(yíng)，質(zhì)量為首，誠(chéng)信*，泰尼電氣小廖竭誠(chéng)為您服務(wù)！?。?/p>
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DWYER INSTRUMENTS 25PSIG SER 3000 PRESSURE SWITCH/GAGE
MICRONICS COMPUTERS INC. EXPRESS 450 MOTHERBOARD 874009
FUJI ELECTRIC 225A 600VAC 3 POLE CIRCUIT BREAKER BU-JSB
MILLER SERIES IPA, AIR CYLINDER IPA-89B2B-0080-100.000-
AMPHENOL CABLE ASSEMBLY V4213KAK MR16E 15
FANUC CIRCUIT BOARD PCB A16B-1210-0030/06F
MAC PNEUMATIC VALVE 825C-PM-501BA-552
SIPCO TECHNOGEAR 3/4" SHAFT DIA. GEARBOX, CBS045S001-15
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3M 7" X 7/8" GRADE 80 984C REGAL RB FIBRE DISCS, 51144-
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CASI-RUSCON CARD READER SYS 430121001 / 430095001 / 110
HONEYWELL VPR CONTROL BOARD VPB/ST/N/05
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HONEYWELL VPR CONTROL BOARD VPB/ST/N/04
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STORK TRONICS TEMPERATURE CONTROLLER ST48-35.04PHR
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NORCO IL I B AL 74 3 FILTER HOUSING, NNB
FANUC EE-3505-585-001 REV. 1.0 100V BRAKE CABLE, NNB
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