PLC的外部設(shè)備主要是指控制中的輸入輸出設(shè)備，其中輸人設(shè)備是對(duì)發(fā)出各種控制的主令電器，在編寫(xiě)控制程序時(shí)必須注意外部輸入設(shè)備使用的是常開(kāi)還是常閉觸點(diǎn)，并以此為基礎(chǔ)進(jìn)行程序編制。否則易出現(xiàn)控制錯(cuò)誤。 在PLC內(nèi)部存儲(chǔ)器中有專用于輸入狀態(tài)存儲(chǔ)的輸入繼電器區(qū)，各輸入設(shè)備（開(kāi)關(guān)、按鈕、行程開(kāi)關(guān)或傳感器）的狀態(tài)經(jīng)由輸入接口電路存儲(chǔ)在該區(qū)域內(nèi)，每個(gè)輸入繼電器可存儲(chǔ)一個(gè)輸入設(shè)備狀態(tài)。PLC中使用的"繼電器"并非實(shí)體繼電器，而是"軟繼電器"，可提供無(wú)數(shù)個(gè)常開(kāi)、常閉觸點(diǎn)用于編程。每個(gè)"軟繼電器"僅對(duì)應(yīng)PLC存儲(chǔ)單元中的一位（bit），該位狀態(tài)為"1"，表示該"軟繼電器線圈"通電，則程序中所有該繼電器的觸點(diǎn)都。輸入繼電器作為PLC接收外部主令的器件，通過(guò)接線與外部輸入設(shè)備相聯(lián)系，其"線圈"狀態(tài)只能由外部輸入驅(qū)動(dòng)。
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10P50400006 Emerson Rosemount Multi-Pure Control Processor II (10P50400006)
10P50840004 Emerson Rosemount Keyboard Interface with Video Isolator (10P50840004)
10P50870004 Emerson Rosemount Coordinator Processor IV+ (10P50870004)
10P52760001 Emerson Rosemount Tap Box A (10P52760001)
10P52790001 Emerson Rosemount Tap Box B (10P52790001)
10P53140001 Emerson Rosemount Communication Motherboard (10P53140001)
10P53200001 Emerson Rosemount PLC Interface Card Cage Assembly (10P53200001)
10P53240001 Emerson Rosemount Trackball (10P53240001)
10P53240011 Emerson Rosemount Trackball (10P53240011)
10P53330001 Emerson Rosemount RNI Ethernet/Peerway Interface (10P53330001)
10P53520006 Emerson Rosemount Discrete Field Interface Module (FIM) (10P53520006)
10P54040004 Emerson Rosemount Analog Input Field Interface Module (FIM) (10P54040004)
10P54080004 Emerson Rosemount Analog Output Field Interface Module (10P54080004)
10P54440002 Emerson Rosemount FIC 4-20 MA (10P54440002)
10P54470002 Emerson Rosemount FIC Pulse I/O (10P54470002)
10P54560001 Emerson Rosemount Communications Connect V (10P54560001)
10P54770001 Emerson Rosemount M/PT Analog Termination Panel (10P54770001)
10P54770002 Emerson Rosemount M/PT Analog Term Panel - Remote (10P54770002)
10P54880001 Emerson Rosemount Port I/O - RS422/RS232 Interface Module (10P54880001)
10P55270010 Emerson Rosemount OI-V Processor Module (10P55270010)
10P55290002 Emerson Rosemount FIC 4-20 MA (10P55290002)
10P56500001 Emerson Rosemount Controller Card File (10P56500001)
10P56910001 Emerson Rosemount Operator Keyboard Interface Card (10P56910001)
10P57070001 Emerson Rosemount Loop Power Module (10P57070001)
10P57520007 Emerson Rosemount MPC5 Controller Processor (10P57520007)
10P57700005 Emerson Rosemount Analog Input Field Interface Module (FIM) (10P57700005)
10P59150002 Emerson Rosemount Analog I/O Module (10P59150002)
18914-13 Emerson Rosemount RTD Input Module (18914-13) Alt# 55P0111X172
1984-1691-0050 Emerson Rosemount RGB Video Cable Set (3-Coax) (1984-1691-0050)
1984-2120-0008 Emerson Rosemount OI Processor Board (1984-2120-0008)
21860350 Emerson Rosemount Keyboard (21860350)
2186035E Emerson Rosemount Engineering Keyboard (2186035E)
70-OAC5A Grayhill AC Output Module (70-OAC5A)
CA-RTCKM11 Emerson Rosemount Replacement Call Up Keyboard Membrane (CA-RTCKM11) Alt# 01984-2372-00xx
CA-RTCS21 Emerson Rosemount Replacement RS3 Compatible Screen 21 (CA-RTCS21)
CA-RTEK11 Emerson Rosemount Replacement Enhanced RS3 Keyboard (CA-RTEK11)
CA-RTFDB11 Emerson Rosemount Replacement Flash Disk Board (CA-RTFDB11)
CA-RTFTB11 Emerson Rosemount Replacement Flash Tape Board (CA-RTFTB11)
CA-RTOKM11 Emerson Rosemount Replacement Operator Keyboard Membrane (CA-RTOKM11)
一個(gè)老人在高速行駛的火車上，不小心把剛買(mǎi)的新鞋從窗口掉了一只，周圍的人倍感惋惜，不料老人立即把第二只鞋也從窗口扔了下去。這舉動(dòng)更讓吃一驚。老人解釋說(shuō)：“這一只鞋無(wú)論多么昂貴，對(duì)我而言已經(jīng)沒(méi)有用了，如果有誰(shuí)能撿到一雙鞋子，說(shuō)不定他還能穿呢！”
感悟：成功者善于放棄。
CA-RTTB11 Emerson Rosemount Replacement Trackball (CA-RTTB11)
CA-RTTBM11 Emerson Rosemount Replacement Trackball Membrane (CA-RTTBM11) Alt# 01984-2372-00xx
CA-RTVP11 Emerson Rosemount Replacement RS3 Virtual Printer (CA-RTVP11)
CP6103X1-CA1 Emerson Rosemount Power Supply (CP6103X1-CA1)
LQ20019250 Emerson Rosemount Replacement Trackball for RS3 Operator Keyboards (LQ20019250)
OAC5 OPTO 22 AC Output Relay (OAC5)
PWA1362-0001 Emerson Rosemount Non-ISO & ISO Input/Output (PWA1362-0001)
PWA2543-001 Emerson Rosemount Communications Connector III (PWA2543-001)
PWA78894-01 Emerson Rosemount Monitor Extender (PWA78894-01)
PWA79056-01 Emerson Rosemount System Monitor Extender (PWA79056-01)
PWA79063-01 Emerson Rosemount Power Supply Extenders (PWA79063-01)
1756-A10
1756-A13
1756-A17
1756-A4
1756-A4LXT
1756-A5XT
1756-A7
1756-A7LXT
1756-A7XT
1756-BA1
1756-BA2
1756-BATA
1756-BATM
1756-CFM
1756-CN2
1756-CN2R
1756-CN2RXT
1756-CNB
1756-CNBR
1756-CP3
1756-CPR2
1756-DH485
1756-DHRIO
1756-DHRIOXT
1756-DMA31
1756-DMCF003
1756-DMD30
1756-DMD30K
1756-DMF30
1756-DMF30K
1756-DNB
1756-EN2F
1756-EN2T
1756-EN2TR
1756-EN2TXT
1756-EN3TR
1756-ENBT
1756-ECAP
1756-ECAPXT
1756-ENRM
1756-ENRMXT
1756-ENSE
1756-ENSEXT
1756-EWEB
1756-EXT
1756-HIST1G
1756-HIST1G3277
1756-HIST2G
1756-HIST2G3278
1756-HISTBETA
1756-HSC
1756-HYD02
1756-IA16
1756-IA16I
1756-IA32
1756-IA8D
1756-IB16
1756-IB16D
1756-IB16I
1756-IB16IF
1756-IB16ISOE
1756-IB32
1756-IC16
1756-IF16
類型通常按產(chǎn)生的原因、噪聲的和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、浪涌噪聲、高頻振蕩噪聲等；按噪聲的波形、性質(zhì)不同，分為噪聲、偶發(fā)噪聲等；按聲音不同，分為共模和差模。共模和差模是一種比較常用的分類。共模是對(duì)地面的電位差，主要隅網(wǎng)串入、地電位差及空間電磁輻射在線上感應(yīng)的共態(tài)（同方向）電壓送加所形成。共模電壓有時(shí)較大，特別是采用隔離性能差的電器供電室，變送器輸出的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過(guò)不對(duì)稱電路可轉(zhuǎn)換成差模電壓，直接影響測(cè)控，造成元器件損壞（這就是一些I/O模件損壞率較高的原因），這種共?？蔀橹绷鳌⒁嗫蔀榻涣?。差模是指用于兩極間得電壓，主要由空間電磁場(chǎng)在間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模所形襯電壓，這種讓直接疊加在上，直接影響測(cè)量與控制精度。
武漢達(dá)自動(dòng)化設(shè)備有限公司
