在工業(yè)生產(chǎn)中，大量的開關(guān)量順序控制，它按照邏輯條件進(jìn)行順序，并按照邏輯關(guān)系進(jìn)行連鎖保護(hù)的控制，及大量離散量的數(shù)據(jù)采集。上，這些功能是通過氣動或電氣控制來實(shí)現(xiàn)的。1968年美國GM（通用汽車）公司提出取代繼電氣控制裝置的要求，第二年，美國數(shù)字公司研制出了基于集成電路和電子技術(shù)的控制裝置，采用程序化的手段應(yīng)用于電氣控制，這就是代可編程序控制器，稱Programmable Controller（PC）。
個(gè)人計(jì)算機(jī)（簡稱PC）發(fā)展起來后，為了方便，也為了反映可編程控制器的功能特點(diǎn)，可編程序控制器定名為Programmable Logic Controller（PLC），現(xiàn)在，仍常常將PLC簡稱PC。
PLC的定義有許多種。電工會（IEC）對PLC的定義是：可編程控制器是一種數(shù)字運(yùn)算操作的電子，專為在工業(yè)下應(yīng)用而設(shè)計(jì)。它采用可編程序的存貯器，用來在其內(nèi)部存貯執(zhí)行邏輯運(yùn)算、順序控制、定時(shí)、計(jì)數(shù)和算術(shù)運(yùn)算等操作的指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機(jī)械或生產(chǎn)?？删幊绦蚩刂破骷捌溆嘘P(guān)設(shè)備，都應(yīng)按易于與工業(yè)控制形成一個(gè)整體，易于擴(kuò)充其功能的原則設(shè)計(jì)。
上世紀(jì)80年代至90年代中期，是PLC發(fā)展快的時(shí)期，年增長率一直保持為30~40%。在這時(shí)期，PLC在處理模擬量能力、數(shù)字運(yùn)算能力、人機(jī)接口能力和網(wǎng)絡(luò)能力大幅度，PLC逐漸控制領(lǐng)域，在某些應(yīng)用上取代了在控制領(lǐng)域處于統(tǒng)治地位的DCS。
PLC具有通用性強(qiáng)、使用方便、適應(yīng)面廣、可靠性高、抗能力強(qiáng)、編程簡單等特點(diǎn)。PLC在工業(yè)自動化控制特別是順序控制中的地位，在可預(yù)見的將來，是無法取代的。
豐澤
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2死生契闊，與子成說。執(zhí)子之手，與子偕老。-佚名《詩經(jīng)邶風(fēng)擊鼓》-
10B7238X012 Emerson Fisher Digital M7608-BH, RAM Module 4MB (10B7238X012)
10B7246X012 Emerson Fisher Digital M7606, CPU Card for RT VAX (10B7246X012)
10B7247X012 Emerson Fisher Disk Controller (10B7247X012)
11B0134X012 Emerson Fisher VDU Controller 115/230V (11B0134X012)
11B5804X212 Emerson Fisher CL6851X1-A2 Isolated Voltage Input Module (11B5804X212)
12P0083X032 Emerson Fisher CL6897X1-A1 Analog Input Term Panel (12P0083X032)
12P0083X052 Emerson Fisher CL6897X1-A1 Analog Input Term Panel (12P0083X052)
12P0097X012 Emerson Fisher CL6787X1-A1 I/O Module Term Panel (12P0097X012)
12P0097X0132 Emerson Fisher CL6787X1-A1 I/O Module Term Panel (12P0097X0132)
12P0097X032 Emerson Fisher CL6787X1-A1 I/O Module Term Panel (12P0097X032)
12P0103X022 Emerson Fisher Pulse Count Input Termination Panel (12P0103X022)
12P0123X072 Emerson Fisher CL6898X1-A1 Analog Term Panel (12P0123X072)
12P0137X032 Emerson Fisher CL6753X1-A10 Debounce Input Module (12P0137X032)
12P0247X032 Emerson Fisher CL6895X1-A1 Term Panel (12P0247X032)
12P0248X032 Emerson Fisher CL6896X1-A1 Term Panel (12P0248X032)
12P0268X012 Emerson Fisher CL6885X1-A1 Analog Term Panel (12P0268X012)
12P0269X012 Emerson Fisher CL6886X1-A1 Analog Term Panel (12P0269X012)
12P0322X012 Emerson Fisher Dual Channel Single Ended Analog Input Module (12P0322X012)
12P0323X032 Emerson Fisher CL6859X1-A5 Smart Device Input Module (12P0323X032)
12P0476X022 Emerson Fisher MPU (12P0476X022)
12P0479X062 Emerson Fisher Input Output Driver Board (12P0479X062) CL7675X1-A10
12PO145X022 Emerson Fisher 60 VDC 3.5A Output (12PO145X022)
20B4904X022 Emerson Fisher Disk Relay Module (20B4904X022)
21B5161X022 Emerson Fisher CL6751X1-A5 120 VAC Input Module (21B5161X022)
21B5164x022 Emerson Fisher CL6751AI Debounce Module (21B5164x022)
21B5165X022 Emerson Fisher CL6751X1-A4 Relay Contact Input Module (21B5165X022)
21B5169X022 Emerson Fisher CL6752X1-A2 Digital Output Module (21B5169X022)
22B5197X012 Emerson Fisher Relay Contact Input (22B5197X012)
30B4113X012 Emerson Fisher IAC MPU PWB Asssembly (30B4113X012)
30B4114X012 Emerson Fisher CL7011X1-A2 Computing Controller 4 Hz (30B4114X012)
30B4114X01R Emerson Fisher Computing Control Board (30B4114X01R)
30B7248X022 Emerson Fisher CRIMISCX1-A3 MPU/ROM Assembly (30B7248X022)
30B8625X012 Emerson Fisher RAM/Interface PWB (30B8625X012)
31B0124X022 Emerson Fisher MPU/ROM Board (31B0124X022)
31B0131X022 Emerson Fisher MPU Memory (31B0131X022)
31B0954X012 Emerson Fisher DH6220X1-BA1 MPU/ROM Module (31B0954X012)
31B0954X022 Emerson Fisher DH6220X1-BA2 MPU/ROM Board (31B0954X022)
31B0954X032 Emerson Fisher DH6220X1-BA3 MPU/ROM Board (31B0954X032)
31B0955X022 Emerson Fisher MPU/ROM Y (31B0955X022)
31B1834X032 Emerson Fisher Parallel Buffer Card (31B1834X032)
31B6459X012 Emerson Fisher Computing Controller - 4 Hz (31B6459X012)
31B7584X032 Emerson Fisher Power Distribution Panel (31B7584X032)
31B849801R Emerson Fisher Keyboard Logic PWB Assy (31B849801R)
32B7743X032 Emerson Fisher CP6701X1-FA5 Power Converter Card (32B7743X032)
33B5232X042 Emerson Fisher CIA Interface Card (33B5232X042) DH7001X1-A4
35A0193X122 Emerson Fisher Pushbutton Logic Board (35A0193X122)
35A5316X012 Emerson Fisher INT. Relay N.C. and N.O (35A5316X012)
36A2654X022 Emerson Fisher DC RAM Card (36A2654X022)
36A3557X012 Emerson Fisher Parallel Buffer Card (36A3557X012) DM6003X1-GA1
36A385X0A2 Emerson Fisher Stocking Module (36A385X0A2)
36A3885X072 Emerson Fisher MUX TERMN ACO (36A3885X072)
36A3885X092 Emerson Fisher MUX TERMN AC2 (36A3885X092)
36A3885X0A2 Emerson Fisher PWB Assembly MUX COMMON/A (36A3885X0A2)
36A3886X062 Emerson Fisher MUX TERM ISO (36A3886X062)
36A3887X012 Emerson Fisher MUX TERM SE (36A3887X012)
36A3888X012 Emerson Fisher MUX TERMN DIN (36A3888X012)
36A3888X022 Emerson Fisher MUX TERMN PCI (36A3888X022)
36A4751X022 Emerson Fisher IAC PIO Module (36A4751X022)
36A7633X022 Emerson Fisher DCV I/O Mass Concentrator Module (36A7633X022)
36A8449X012 Emerson Fisher DM6001X1-C1 Non-Volatile Memory Module (36A8449X012)
36A9554X062 Emerson Fisher Distribution Panel (36A9554X062)
37A0063X022 Emerson Fisher CIA Module (37A0063X022)
37A6976X072 Emerson Fisher Floppy Disc CTR (37A6976X072)
37A8986X012 Emerson Fisher Isolated I/O Pwb Assembly (37A8986X012)
38A1533X012 Emerson Fisher MPU/ROM (38A1533X012)
38A7465X012 Emerson Fisher Volatile MEM (38A7465X012)
39A0363X012 Emerson Fisher CL6003X1 IAC Memory Module (39A0363X012)
39A0363X022 Emerson Fisher IAC Memory Module (39A0363X022)
39A0724X032 Emerson Fisher DH6011X1-GA2 MPU/ROM (39A0724X032)
39A0727X012 Emerson Fisher PWB Y COM (39A0727X012)
39A0727X032 Emerson Fisher DH7001X-A3 CIA (39A0727X032)
39A0727X042 Emerson Fisher DH7001X1-A3 CIA Interface Card (39A0727X042)
39A1173X042 Emerson Fisher Discrete Output Latch Module (39A1173X042)
39A1891X012 Emerson Fisher IAC DIO Module (39A1891X012)
39A2990X012 Emerson Fisher Common RAM Card (39A2990X012)
39A2990X052 Emerson Fisher Common RAM Card (39A2990X052)
39A2990X092 Emerson Fisher Common RAM Card (39A2990X092)
39A2990X122 Emerson Fisher Common RAM Card (39A2990X122)
39A3150X062 Emerson Fisher DH6001X1-FA4 MPU/ROM Board (39A3150X062)
39A4278X122 Emerson Fisher MPU ROM Module (39A4278X122)
39A5379X042 Emerson Fisher CL7312X1-CA2 RD MNML COM Module (39A5379X042)
39A6178X012 Emerson Fisher MUX AIN SE 1-5 (39A6178X012)
39A7234X062 Emerson Fisher RTD Input Unit (39A7234X062)
39A7236X012 Emerson Fisher PC Tranitter Board (39A7236X012)
39A7256X01 Emerson Fisher DH7010X1-A1 5V Power Assembly (39A7256X01)
39A7265X012 Emerson Fisher 5V Power Assembly (39A7265X012)
39A7279X012 Emerson Fisher ISO DISC. I/P (39A7279X012)
39A8568X012 Emerson Fisher Analog Input Module (39A8568X012)
39A8571X032 Emerson Fisher Serial Interface Module (39A8571X032)
39A8571X042 Emerson Fisher Serial Interface Module (39A8571X042)
39A8571X052 Emerson Fisher Serial Interface Module P3.0 (39A8571X052)
40B1052X01 Emerson Fisher Membrane Keyboard (40B1052X01)
40B1052X01R Emerson Fisher Membrane Keyboard (40B1052X01R)
40B1054X092 Emerson Fisher Keyboard Electronic Assy (40B1054X092)
40B1054X11R Emerson Fisher Keyboard Electronic Assy (40B1054X011R)
40B1743X042 Emerson Fisher MPU File Assembly without Modules (40B1743X042)
40B2085X012 Emerson Fisher Data Port Assembly (40B2085X012)
40B6016X032 Emerson Fisher I/O Driver Board (40B6016X032)
40B8624-S Emerson Fisher RAM Interface Module (40B8624-S)
41B0985X022 Emerson Fisher Power Supply Card (41B0985X022)
41B1841X012 Emerson Fisher Dual CIA (41B1841X012)
41B1841X022 Emerson Fisher Dual CIA P8.0 (41B1841X022)
41B5222X33 Emerson Fisher CL6821X1-A4 Analog I/O Card (41B5222X33)
41B5236X172 Emerson Fisher MPU Module (IFC) (41B5236X172)
41B7236X082 Emerson Fisher CL6863X1-A2 Isolated Analog Input Term Panel (41B7236X082)
41B7284X012 Emerson Fisher CL6861X1-A1 Analog Term Panel (41B7284X012)
41B7284X022 Emerson Fisher CL6861X1-A2 Analog Input Term Panel (41B7284X022)
41B7287X022 Emerson Fisher CL6871X1-A2 Analog Output Term Panel (41B7287X022)
41B7287X032 Emerson Fisher CL6871X1-A3 Analog Output Term Panel (41B7287X032)
41B7287X042 Emerson Fisher CL6871X1-A4 Analog Output Term Panel (41B7287X042)
41B7290X022 Emerson Fisher Relay Output Termination Panel (41B7290X022)
41B7291X012 Emerson Fisher CL6784X1-A1 Term Panel (41B7291X012)
41B7291X032 Emerson Fisher CL6784X1-A3 Redundant Discrete Term Panel (41B7291X032)
41B7389X052 Emerson Fisher Discrete I/O Termination Panel (41B7389X052)
41B7389X062 Emerson Fisher Discrete I/O Termination Panel (41B7389X062)
41B7389X072 Emerson Fisher Discrete I/O Termination Panel (41B7389X072)
41B9148X022 Emerson Fisher CL6862X1-A2 Redundant Single Ended Term Panel (41B9148X022)
41B9148X032 Emerson Fisher CL6862X1-A2 Redundant Single Ended Term Panel (41B9148X032)
41B9152X012 Emerson Fisher CL6864X1-A1 Redundant Isolated Analog Term Panel (41B9152X012)
41B9152X022 Emerson Fisher CL6864X1-A1 Redundant Isolated Analog Term Panel (41B9152X022)
42B0134X012 Emerson Fisher Membrane Keyboard (42B0134X012)
42B1427X052 Emerson Fisher Power Conversion Assy (42B1427X052)
43B5308X012 Emerson Fisher Discrete I/O Termination Panel (43B5308X012)
43B5311X012 Emerson Fisher CL6863X1-A2 Isolated Analog Input Term Panel (43B5311X012)
43B5336X022 Emerson Fisher Serial I/O Driver (43B5336X022)
43B5452X042 Emerson Fisher Single Ended Smart Tranitter Term Panel (43B5452X042)
44B2733X012 Emerson Fisher Alarm Interface Unit (44B2733X012)
44B2733X022 Emerson Fisher Alarm Interface Unit (44B2733X022)
44B2940X012 Emerson Fisher CL7675X1 Serial I/O Module (44B2940X012)
46A2684X01R Emerson Fisher Analog Input Mux Module - Single Ended (46A2684X01R)
46A2784X012 Emerson Fisher Pulse Count IP (46A2784X012)
46A3554X012 Emerson Fisher Analog Out 4-20 (46A3554X012)
46A3554X022 Emerson Fisher Analog Output Module (46A3554X022)
46A4233X01R Emerson Fisher Power Supply Card (46A4233X01R)
46A6602X012 Emerson Fisher Config Controller Module (46A6602X012)
46A6607X052 Emerson Fisher CL6003X1-BA2 IAC MPU Module (46A6607X052)
46A6607X072 Emerson Fisher IAC MPU Module (46A6607X072)
46A6607X0F2 Emerson Fisher CL6003 IAC MPU Module (46A6607X0F2)
46A9498X0K2 Emerson Fisher Power Distribution Panel (46A9498X0K2)
47A8968X012 Emerson Fisher DCU I/O (47A8968X012)
47A9476X032 Emerson Fisher CL6601 Power Conversion Assembly (47A9476X032)
48A6602X042 Emerson Fisher CL7001X1-A10 Config Cont w/DIO (48A6602X042)
48A6602X04R Emerson Fisher Configuration Controller (48A6602X04R) CL7001X1-A10
49A8569X042 Emerson Fisher Highway Interface (49A8569X042)
49A8569X07R Emerson Fisher Data Highway Interface P8.2 (49A8569X07R)
55P0109X032 Emerson Fisher CL6855X1-A7 Isolated Voltage Input Module (55P0109X032)
56A4592X012 Emerson Fisher Card Rack, DP CSL Backplane (56A4592X012)
57A6842X092 Emerson Fisher Trend Display MEM1 (57A6842X092)
57A6843X012 Emerson Fisher Trend Shared Memory (57A6843X012)
57A6844X142 Emerson Fisher Trend Display CPU (57A6844X142)
57A6844X152 Emerson Fisher Trend Link CPU (57A6844X152)
57A9381X072 Emerson Fisher Trend Display MEM2 (57A9381X072)
57A9382X062 Emerson Fisher Trend Link MEM1 (57A9382X062)
57A9383X062 Emerson Fisher Trend Link MEM2 (57A9383X062)
CD6021X-EB1 Emerson Fisher Indicator Controller (CD6021X-EB1)
CD6201 Emerson Fisher Op Module Control (CD6201)
CD6201X1 Emerson Fisher Final Assembly Operator Station (CD6201X1) 49A7243X0A2
CD6201X1-EB1 Emerson Fisher Operator Module Control Assembly (CD6201X1-EB1) 46A3078X032
CD6201X1-EB2 Emerson Fisher Operator Interface Station (CD6201X1-EB2)
CD6202 Emerson Fisher Indicator Display (CD6202)
CD6202X1-EA1 Emerson Fisher Indicator Control (CD6202X1-EA1)
CD7601X1-EB2 Emerson Fisher Operator Interface (CD7601X1-EB2)
CL6011X1-B1 Emerson Fisher IAC MPU Power Board (CL6011X1-B1) 30B4113X01R
CL6640X1-A2 Emerson Fisher CONTROLLER SRX DATA HIWAY (CL6640X1-A2)
CL6721X1-A1 Emerson Fisher Discrete Input Output Module (CL6721X1-A1) 41B5215X052
CL6721X1-A3 Emerson Fisher Input Output Board (CP6721X1-A3) 41B5215X102
CL6721X1-A4 Emerson Fisher Discrete Output Board (CL6721X1-A4) 41B5215X132
CL6751A2 Emerson Fisher Input Relay Module (CL6751A2) 21B5163X022
CL6751A5 Emerson Fisher Input Relay Module (CL6751A5) 21B5161X022
CL6753X1-A2 Emerson Fisher 3-32 VDC Fast Input (CL6753X1-A2)
CL6754X1-A3 Emerson Fisher Output Module (CL6754X1-A3) 12P0146X022
CL6784X1-A1 Emerson Fisher Discrete I/O Termination Panel (CL6784X1-A1) 41B7291X012
CL6821-A1 Emerson Fisher Analog I/O Module (CL6821-A1) 41B5222X072
CL6821X1-A3 Emerson Fisher Analog I/O Module (CL6821X1-A3) 41B5222X122
CL6821X1-A4 Emerson Fisher Analog I/O Module (CL6821X1-A4) 41B5222X33R
CL6821X1-A5 Emerson Fisher Analog I/O Module P1.5.2 (CL6821X1-A5) 41B5222X44R
CL6821X1-A6 Emerson Fisher Analog I/O Module P1.5.2 (CL6821X1-A6) Alt # 12P0663X032
CL6822X1-A3 Emerson Fisher Smart Tranitter Input Card (CL6822X1-A3) 33B5239X532
CL6827X1-A1 Emerson Fisher Input Module (CL6827X1-A1) 12P1392X062
CL6841X1-A1 Emerson Fisher Analog Input Interface Card (CL6841X1-A1) 41B9144X022
CL6841X1-A2 Emerson Fisher Analog Input Interface Card (CL6841X1-A2) 41B9144X032
CL6853X1-A10 Emerson Fisher Input Output Adapter (CL6853X1-A10) 11B5805X242
CL6854X1-A1 Emerson Fisher Type J TC Module (CL6854X1-A1)
CL6854X1-A2 Emerson Fisher Type J TC Module (CL6854X1-A2)
CL6854X1-A3 Emerson Fisher Type K TC Module (CL6854X1-A3)
CL6859X1-A1 Emerson Fisher Analog Input Module (CL6859X1-A1)
CL6861X1-A2 Emerson Fisher Analog Input Termination Panel (CL6861X1-A2) 41B7284X022
CL6862X1-A1 Emerson Fisher Redundant Single Ended Analog Input Termination Panel (CL6862X1-A1)41B9148X012-8
CL6863X1-A1 Emerson Fisher Isolated Analog Input Termination Panel (CL6863X1-A1)
CL6863X1-A2 Emerson Fisher Isolated Analog Input Termination Panel (CL6863X1-A2)
CL6871X1-A1 Emerson Fisher Analog Output Termination (CL6871X1-A1)
CL6871X1-A3 Emerson Fisher Analog Output Termination (CL6871X1-A3)
CL6872X1-A2 Emerson Fisher Redundant Analog Output Termination (CL6872X1-A2)
CL6885X1-A1 Emerson Fisher Analog Output Termination Panel (CL6885X1-A1) 12P0268X012
CL7001X1-A10 Emerson Fisher Configuration Controller (CL7001X1-A10) 48A6602X04R
CL7001X1-A9 Emerson Fisher Configuration Controller (CL7001X1-A9)
CL7002X1-A2 Emerson Fisher Computing Controller Memory Board (CL7002X1-A2)
CL7005X1-A1 Emerson Fisher IAC PIO Module (CL7005X1-A1)
CL7006X1 Emerson Fisher IAC Backplane(CL7006X1)
CL7011X1-A1 Emerson Fisher Controller Board (CL7011X1-A1) 38A5153X012
CL7014-A1 Emerson Fisher Redundant IAC DIO Board (CL7014-A1) 39A1891X012
CL7015X1-A1 Emerson Fisher IAC Process I/O Board (CL7015X1-A1) 38A9426X012
CL7015X1-A3 Emerson Fisher IAC Process I/O Board (CL7015X1-A3)
CL7651X1-A3 Emerson Fisher Communications Interface Assembly Card (CL7651X1-A3) 48A3673
CL7652X1-A2 Emerson Fisher Communications Interface Assembly Card (CL7652X1-A2) 41B1841X042
CL7675X1-A10 Emerson Fisher Input Output Driver Board (CL7675X1-A10) 12P0479X062
CL7675X1-A9 Emerson Fisher Serial Input Output Module (CL7675X1-A9) 44P2940X012
CL7701X1-A1 Emerson Fisher Redundant Communications Interface Assembly Card (CL7701X1-A1) 32B7734X022
CN6201X1-DA1 Emerson Fisher Indicator Adaptor Module (CN6201X1-DA1)
CN6201X1-EA1 Emerson Fisher Indicator Controller (CN6201X1-EA1)
CN6202 Emerson Fisher Indicator Controller (CN6202)
CN6202X1-EA1 Emerson Fisher Indicator Controller (CN6202X1-EA1)
CP2601 Emerson Fisher Rack (CP2601)
CP6101 Emerson Fisher Power Supply (CP6101)
CP6103X1-AA1 Emerson Fisher Power Supply Rack (CP6103X1-AA1)
CP6103X1-CA1 Emerson Fisher Power Supply (CP6103X1-CA1)
CP6121X1-A2 Emerson Fisher Power Converter Assembly (CP6121X1-A2) 42B1427X042
CP6201 Emerson Fisher Controller Card File (CP6201)
CP6211 Emerson Fisher Controller Card File (CP6211)
CP6212X1-EA2 Emerson Fisher Multilayer Termination Panel (CP6212X1-EA2) 48A9448X022
CP6601X1-CA3 Emerson Fisher MUX Serial Interface Board (CP6601X1-CA3) 32B9765X092
CP6701X1-EA1 Emerson Fisher Power Connection Board (CP6701X1-EA1)41B5849X012
CP6701X1-EA2 Emerson Fisher Power Connection Board (CP6701X1-EA2) 41B5849X022
CP6701X1-FA1 Emerson Fisher Power Converter Card (CP6701X1-FA1) 41B5229X032
CP6701X1-FA6 Emerson Fisher Power Converter Card (CP6701X1-FA6) 32B7743X062
CP7202 Emerson Fisher Power Converter Card (CP7202) 46A4281X01R
CP7202X1-A1 Emerson Fisher Power Conversion Assembly (CP7202X1-A1)
CS6201X1-FA1 Emerson Fisher Service Transfer Unit PC Board (CS6201X1-FA1) 37A0401X032
DC6400X1-EA28 Emerson Fisher Keyboard Power Supply (DC6400X1-EA28) Alt # 40B1054X11R
DC6400X1-EA5 Emerson Fisher Membrane Keyboard (DC6400X1-EA5)
DC6400X1-F Emerson Fisher Pushbutton Logic Board (DC6400X1-F) 35A0193X122
DC6450X1-HA5 Emerson Fisher Highway Interface Module (DC6450X1-HA5)
DC6460X1-KB1 Emerson Fisher Serial Interface Module (DC6460X1-KB1)
DC6460X1-LA1 Emerson Fisher Matrox VDU Controller (DC6460X1-LA1)
DH6003 Emerson Fisher Card Rack (DH6003)
DH6004X1-FA1 Emerson Fisher MPU/ROM (DH6004X1-FA1)
DH6005X1-DA1 Emerson Fisher I/O Power Module (DH6005X1-DA1)
DH6005X1-EA6 Emerson Fisher MPU/ROM/RAM Module (DH6005X1-EA6) 31B0124X022
DH6009 Emerson Fisher Rack (DH6009)
DH6011 Emerson Fisher Rack (DH6011)
DH6011X1-GA2 Emerson Fisher MPU/ROM (DH6011X1GA2) 39A0724X042
DH6220X1-BA1 Emerson Fisher MPU ROM Module (DH6220X1-BA1)
DH7001X1-A3 Emerson Fisher Controller/Interface PC Board (DH7001X1-A3) 39A0727X072
DH7001X1-A4 Emerson Fisher CIA Interface Card (DH7001X1-A4) 33B5232X042
DH7201X1-A1 Emerson Fisher Common RAM Board (DH7201X1-A1) 39A2990X012
DH7201X1-A2 Emerson Fisher Power Connection Board (DH7201X1-A2) 39A2990X102
DH7201X1-A3 Emerson Fisher Common RAM Board (DH7201X1-A3) 39A2990X032
DH7202X1-A1 Emerson Fisher DMA RAM Assembly Board (DH7202X1-A1) 39A2710X012
DM6001X1-FA1 Emerson Fisher MUX I/O Interface Board (DM6001X1-FA1) 36A3556X032
DM6001X1-GA1 Emerson Fisher Power Supply Card (DM6001X1-GA1) 41B0985X022
DM6001X1-KA15 Emerson Fisher MPU ROM Module (DM6001X1-KA15) 39A4278X122
DM6003X1-GA1 Emerson Fisher Parallel Buffer Card (DM6003X1-GA1) 36A3557X012
DM6004 Emerson Fisher Cardfile (DM6004)
DM6311X1-A1 Emerson Fisher MUX Analog Input (DM6311X1-A1) 39A6178X012
DM6311X1-B1 Emerson Fisher PWB Assembly MUX Common (DM6311X1-B1) 36A3885X0A2
DM6361X1-A1 Emerson Fisher PC Board Isolated Discrete Input (DM6361X1-A1) 39A7279X012
DM6363X1-A2 Emerson Fisher Discrete Input Board (DM6363X1-A2) 30B8651X012
DM6371X1-A2 Emerson Fisher Pulse Counter Input Board (DM6371X1-A2) 46A2784X022
DM6411X1-A1 Emerson Fisher MUX Analog Output Module (DM6411X1-A1) 46A3554X022
DM6421X1-A1 Emerson Fisher Analog Output Module (DM6421X1-A1) 46A3554X012
DM6461X1-A3 Emerson Fisher Discrete Output Board (DM6461X1-A3) 39A1173X012
DM6462X1-B1 Emerson Fisher MUX Internal Relay Module (DM6462X1-B1) 35A5316X012
M7478 Emerson Fisher Digital CPU for RT Vax 1000 (M7478)
M7555 Emerson Fisher Digital Disk Controller (M7555)
M7606 Emerson Fisher Digital CPU Module (M7606)
M7608 Emerson Fisher Digital Memory Module (M7608)
M7609 Emerson Fisher DEC Memory Module (M7609)
M9047 Emerson Fisher Grant Continuity Card (M9047)
當(dāng)下級后備保護(hù)形成停電時(shí)，若查明有分路保護(hù)，斷路器未跳閘，應(yīng)拉開拒動的斷路器，恢復(fù)下級電源斷路器；若查明各分路開關(guān)均未（也能夠是保護(hù)拒掉落牌），則應(yīng)檢查停電范圍內(nèi)裝備有沒有缺點(diǎn)，若無缺點(diǎn)應(yīng)拉開一切分路斷路器，合上電源斷路器后，一一試送各分路斷路器，當(dāng)送到某一分路時(shí)電源斷路器又再跳閘，則可判明該斷路器為故。
