HIMA F7126HIMA F7126
為了便于讀出、檢查和修改,用戶程序一般存于CMOS靜態(tài)RAM中,用鋰電池作為后備電源,以保證掉電時(shí)不會(huì)丟失信息。為了防止干擾對(duì)RAM中程序的破壞,當(dāng)用戶程序經(jīng)過運(yùn)行正常,不需要改變,可將其固化在只讀存儲(chǔ)器EPROM中?,F(xiàn)在有許多PLC直接采用EEPROM作為用戶存儲(chǔ)器。
工作數(shù)據(jù)是PLC運(yùn)行過程中經(jīng)常變化、經(jīng)常存取的一些數(shù)據(jù)。存放在RAM中,以適應(yīng)隨機(jī)存取的要求。在PLC的工作數(shù)據(jù)存儲(chǔ)器中,設(shè)有存放輸入輸出繼電器、輔助繼電器、定時(shí)器、計(jì)數(shù)器等邏輯器件的存儲(chǔ)區(qū),這些器件的狀態(tài)都是由用戶程序的初始設(shè)置和運(yùn)行情況而確定的。根據(jù)需要,部分?jǐn)?shù)據(jù)在掉電時(shí)用后備電池維持其現(xiàn)有的狀態(tài),這部分在掉電時(shí)可保存數(shù)據(jù)的存儲(chǔ)區(qū)域稱為保持?jǐn)?shù)據(jù)區(qū)。
由于系統(tǒng)程序及工作數(shù)據(jù)與用戶無直接,所以在PLC 產(chǎn)品樣本或使用手冊(cè)中所列存儲(chǔ)器的形式及容量是指用戶程序存儲(chǔ)器。當(dāng)PLC提供的用戶存儲(chǔ)器容量不夠用,許多PLC還提供有存儲(chǔ)器擴(kuò)展功能。
存儲(chǔ)器主要有兩種:一種是可讀/寫操作的隨機(jī)存儲(chǔ)器RAM,另一種是只讀存儲(chǔ)器或可擦除可編程的只讀存儲(chǔ)器ROM、PROM 、EPROM 和EEPROM。
手機(jī)
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Qq:
鄭娟萍
廈門仲鑫航自動(dòng)化設(shè)備有限公司
3)、輸入/輸出接口
輸入/輸出接口是PLC與現(xiàn)場(chǎng)I/O設(shè)備或其它外部設(shè)備之間的連接部件。PLC通過輸入接口把外部設(shè)備(如開關(guān)、按鈕、傳感器)的狀態(tài)或信息讀入CPU,通過用戶程序的運(yùn)算與操作,把結(jié)果通過輸出接口傳遞給執(zhí)行機(jī)構(gòu)(如電磁閥、繼電器、接觸器等)。
在輸入/輸出接口電路中,一般均配有電子變換、光耦合器和阻容濾波等電路,以實(shí)現(xiàn)外部現(xiàn)場(chǎng)的各種信號(hào)與系統(tǒng)內(nèi)部統(tǒng)一信號(hào)的匹配和信號(hào)的正確傳遞,PLC正是通過了這種接口實(shí)現(xiàn)了信號(hào)電平的轉(zhuǎn)換。發(fā)光二極管(LED)用來顯示某一路輸入端子是否有信號(hào)輸入。當(dāng)系統(tǒng)的I/O點(diǎn)數(shù)不夠時(shí),可通過PLC的I/O擴(kuò)展接口對(duì)系統(tǒng)進(jìn)行擴(kuò)展。
AMAT 0140-78035 CABLE, UPPER-LOWER ELECTRONIC SCRUBBER2, WORKING
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AMAT 0190-77552 TWO VALVES INPUT MANIFOLD , USED
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AMAT 0140-77050 Pad conditioner 2,MP5-DVRS 12 & 13, USED
AMAT 0021-13726 BLOCK, OUTPUT, BRUSH MOUNT ASSY, FLOW TH , USED
AMAT 0140-77004 HARNESS, PAD 1, MANIF, USED
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AMAT 0021-13584 END BLOCK, BRUSH MOUNT ASSY, FLOW THRU , USED
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AMAT 0021-13730 SPACER, OUTPUT, BRUSH MOUNT ASSY, FLOW THRU , USED
idec ZY1C-SS3378-3 SW UNIT, USED
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AMAT 0190-14345 NSK DRIVER EP0810AF8-05 , NEW
AMAT 0150-01280 CABLE ASSY LIMIT SWITCH A , NEW
AMAT 0150-03934 CABLE ASSEMBLY PUMP EMO 6FT , NEW
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AMAT 0150-05357 CABLE ASSY W512 SYS MDL C, NEW
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AMAT 0150-14224 CABLE ASSY LEL MONITOR SE , NEW
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MKS 223B-12377 DIFFERENTIAL PRESSURE TRANSDUCER 6.666 kPa , USED
MKS 631A-24175 TYPE 631 BARATRON PRESSURE TRANSDUCER 399.96 Pa , USED
CKD VEC-S8-X0201 PRESSURE CONTROLLER VEC-V8-X0201 VEC-C8-X0201 , USED
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AMAT 0150-15154 CABLE ASSY DVR CH1 TO FI , NEW
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