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　PLC與單片機的差別是：
　　1、PLC是應用單片機構成的比較成熟的控制系統，是已經調試成熟穩定的單片機應用系統的產品，有較強的通用性。
　　2、而單片機可以構成各種各樣的應用系統，使用范圍更廣。單就“單片機”而言，它只是一種集成電路，還必須與其它元器件及軟件構成系統才能應用。
　　3、從工程的使用來看，對單項工程或重復數極少的項目，采用PLC快捷方便，成功率高，可靠性好，但成本較高。
　　4、對于量大的配套項目，采用單片機系統具有成本低、效益高的優點，但這要有相當的研發力量和行業經驗才能使系統穩定。
　　從本質上說，PLC其實就是一套已經做好的單片機(單片機范圍很廣的)系統。
　　但PLC也有其特點：PLC廣泛使用梯形圖代替計算機語言，對編程有一定的優勢。你可以把梯形圖理解成是與匯編等計算器語言一樣，是一種編程語言，只是使用范圍不同!而且通常做法是由PLC軟件把你的梯形圖轉換成C或匯編語言(由PLC所使用的CPU決定)，然后利用匯編或C編譯系統編譯成機器碼!PLC運行的只是機器碼而已。梯形圖只是讓使用者更加容易使用而已。
　　如上所說，那么MCS-51單片機當然也可以用于PLC制作，只是8位CPU在一些高級應用如： 大量運算(包括浮點運算)，嵌入式系統(現在UCOS也能移植到MCS-51)等，有些力不從心而已，不過加上DSP就已經能滿足一般要求了，而且同樣使用梯形圖編程，我們可把梯形圖轉化為C51再利用KEIL的C51進行編譯。我們也能發現不用型號的PLC會選用不同的CPU，其實也說明PLC就是一套已經做好的單片機系統。
　　既然如此，當然也可以用單片機直接開發控制系統，但是對開發者要求相當高(不是一般水平可以勝任的)，開發周期長，成本高(對于一些大型一點的體統你需要做實驗，印刷電路板就需要一筆相當的費用，你可以說你用仿真器，用實驗板來開發，但是我要告訴你，那樣做你只是驗證了硬件與軟件的可行性，并不代表可以用在工業控制系統，因為工業控制系對抗干擾的要求非常高，穩定第一，而不是性能第一，所以你的電路板設計必須不斷實驗，改進)。當你解決了上述問題，你就發現你已經做了一臺PLC了，當然如果需要別人能容易使用你還需要一套使用軟件，這樣你可以不需要把你的電路告訴別人。你也不可能告訴別人。
　　這樣一看PLC其實并不神秘，不少PLC是很簡單的，其內部的CPU除了速度快之外，其他功能還不如普通的單片機。通常PLC采用16位或32位的CPU，帶1或2個的串行通道與外界通訊，內部有一個定時器即可，若要提高可靠性再加一個看家狗定時器問題就解決了。
　　另外，PLC的關鍵技術在于其內部固化了一個能解釋梯形圖語言的程序及輔助通訊程序，梯形圖語言的解釋程序的效率決定了PLC的性能，通訊程序決定了PLC與外界交換信息的難易。對于簡單的應用，通常以獨立控制器的方式運作，不需與外界交換信息，只需內部固化有能解釋梯形圖語言的程序即可。實際上，設計PLC的主要工作就是開發解釋梯形圖語言的程序。現在的單片機完全可以取代PLC。以前的單片機由于穩定性和抗電磁干擾能力比較的弱和PLC是沒有辦法相比的，現在的單片機可能已經做到了高穩定性和很強的抗干擾能力在某些領域已經實現了替換。
 

284D-FHD6P0Z-25-CR-3 DeviceNet Variable Frequency Drive

C200HW-PA204S 電源單元AC110-120V/200-240V帶24VDC使用電源

6ES7400-1TA01-0AA0 底板

1769-OF2 2路模擬量輸出

PXIe-8510/6

ROHM IN-CY-76

SUNPOWER RPS-2800

PCE-5127/7127

NBP1407P(LF)

G4S600-B

1492-MR5X8H21-30 Connection Products

1494V-RB4 Connecting Rod

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CP3B-0WEB-0140-AZ Shielded motor power cable for B8is motor (straight connector). 14 meters

GF-8030R Connecting FlashCable to Bellingham Stanley Refractometer.

IC200UEO008 VersaMax Micro Expansion 8 Output Expansion (8) 24VDC Outputs with ESCP, 24VDC Power Supply (includes IC200CBL501)

IC647ABRM ABR:Allen Bradley RSLinx 7X

IC647PBBBG0 PPS Boiler Bookshelf - BioGrate

IC693CBL300 Rack Expansion Cable, I/O Expansion, 1 Meter

IC754ACC06GAS Gasket for 6 inch QuickPanel View & Control

IMC-313E-X-DRR IMC-D Series Servo Motor Controller, Enhanced, 3 Amp

SLC/1746 System 9399-AIIG A I SERIES INSTALLATION GUIDE

Open Automation Systems 1784-PMCSY4 1784PCI MOTION MODULE SYNCHRONIZATION CABLE

Application-specific products 1404-M605B-DNT MASTER MODULE - PQ 24V POWER SUPPLY DNET COM

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RSI Software Products 9301-2SE3300ESU1 RSVIEW32 RUNTIME 300-1500 UPGRADE IN-SUPT (ES)

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Motion Control MPL-B4530K-SJ24AA MOTOR,SERVO,8.36 NM,4000RPM,SINGL,460V,BRK,11KG

Motion Control 2090-XNRBM-1 RBM CONNECTOR SPARE PARTS KIT

GQPI2D100L2P QUICKPANEL MONO 10.5" LCD GE LABEL

IC646MRA150 View 150 Tag Runtime System

MTR-1N31-I-N-A-S-0 Stepping Motor Nema34, Parallel Wdg

QPM3D200B2P 6 inch Blue Monochrome Mini/ TCP Label/ 24VDC

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20F11ND027AA0NNNNN PowerFlex 753 AC Packaged Drive

22-RF021-BS PowerFlex EMC Filter

2711P-RMCS PanelView Plus 7 Accessory

280S-RA35 ArmorStart Three-Phase Power Media

C200H-ID212 輸入單元,16點, 24 VDC

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PCI-8430/16

PCM-6892

NORCO-630V

DIALOGIC D300PCI-E1-75H

MB865F-R

SIO-DO32P

1492-LG3 IEC Term Blck 5.1x59.5x31.3mm Spr Clp

1494F-S2 Disconnect Switch Handle

軟啟動器 3RW44362BC35

BC647PSC100 Proficy Process Systems 1000 I/O with CIMPLICITY with Global Care

GC647PCM025 GlobalCare Complete for Proficy Change Management Server - 25 Concurrent Users

IC200MDL243 Input 120VAC isolated 16 point.

IC646NTY000 Toyopuc TCP/IP Communications

IC647MHWU01 Machine Edition S/W to H/W Key Upgrade - Order must include customers contact information as well as software serial numbers

IC676CBLPBF020 IP67 Profibus Cordset - 2 Meters - Female Connector w/Leads

IC697MEM733 Expansion RAM, 256K Bytes, CMOS, 32 Bit (Used w/78X CPUs)

IC800SSI104P2RR 4.3A, 115/230V, Profibus S2K Servo Controller for S-Series Motors

ControlLogix/1756 System 1756-STRT3PT CONTROLLOGIX STARTER KIT PORTUGUESE

Industrial Computers 6182H-15TRH15B VVCE 1500, TOUCH, STD MEM, CNET, AC

Process Control 1757-DNBUPG20 DEVICENET LIC UPG 20 DNB

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Support 9303-23S0E01R SUPPORT REINSTATEMENT CONTRACT FOR 9303-23S0E01

Support 9371-EIEC3S SUPT RENEWAL CONTRACT FOR 9371EIEC3

ControlNet Products 1788-FFCT CONTROLNET-FIELDBUS CONFIGURATION TOOL

RSI Software Products 9301-2SE2500DEU3 RSVIEW32 WORKS 300-100K UPGRADE IN-SUPT (DE)

RSI Software Products 9358-BANT10U1R UPGRADE: OUT-SUPT: RSBATCH ARCHIVER 03 TO 10

Motion Control MPL-A4520P-SJ22AA MOTOR,SERVO,6.10 NM,5000RPM,SINGL,230V,6.8KG

Motion Control 2090-UXNPBMP-10S15 CABLE,460V,NON-FLEX,MOTOR POWER,MP,10 GAUGE,15M

CBL-3C-L1D-FLY-20 S2K Feedback Cable, Special for 3rd Party Motors with Hall Commutating Encoders, Flying Leads, 20 Feet

IC641CTL171 Logicmaster 90-70 to Control 90-70 Subscription Upgrade

IC800SLM010N2NE25 100W, 230 VAC SL Servo Motor, 2.5K Quad Encoder

OC647IPWRSTDV00300M iPower Option - Std 300 I/O Dev

20AD8P0A3AYYANC0 PowerFlex 70 AC Drive 8 A at 5 Hp 20A

20DD065A0EYNANASE PowerFlex 700S AC Drive 65 A 50 Hp 20D

20P41AD1K4RA0NNN PowerFlex 460V AC 900 HP DC Drive

2711P-B10C4D8 PanelView Plus Terminal

280-PWRM24G-M4 ArmorConnect 3-PH Power Media drop cable

NT-ZJCAT1-ECV3 支持軟件

6RA2825-6DV61 60A 380V

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DPS-250AB-44

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1492-SPM3D020-N MCB Supplementary Protector 2 A

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BC646MQPS99 Machine Edition View for Quick Panel Unlimited Site License with Proficy GlobalCare Complete

GC647ARC010 GC Reporting Client 10 Pak

HMI-LOD-201 REMOTE MEMORY LOADER

IC646APS30001 Csense Predictive Soft Sensor 1 KPI

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IC660EPM100RR PowerTRAC, 115Vac/125Vdc Power, Electronics Asm only

IC697ACC803 I/O Cable (32 conductor) for IC697Vxxxxx modules. Five feet long

IC756XDV001E64-925 DataViews Development on Solarisx86 64 bit, Addt'l User, English v9.25

FlexLogix System 1794-TB3GS 3-WIRE GROUNDED TERMINAL BASE - SPRING CLAMP

PLC-5/1771 System 1771-FF FUSE KIT FOR 1771-OQ16

Process Control 1757-UPGSIFE UPGRADE HW 620 LCS SER & ENET QUICKBUILDER I/F

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Support 6006-G1DCS SUPT RENEWAL CONTRACT FOR 6006G1DC

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Support F1785-L80C15SERD FIRMWARE UPGRADE FOR 1785-L80C15 PLC5 PROCESSOR MO

RSI Software Products 9301-2SE2350DEU3 RSVIEW32 WORKS 1500-5K UPGRADE IN-SUPT (DE)

RSI Software Products 9701-VWSS250AFRE RSVIEW SE SERVER 250 DISPLAY (FRENCH)

RSI Software Products 9399-VESSELUG RSVESSEL USERS GUIDE

Motion Control 8720MC -B034-AN- 34 AMP B CHASSIS DRIVE, OPEN ENCL., LESS OPTIONS

BC646MPSS50 Logic Developer - PLC Standard - 50 Seat Site Site License

IC300OCS250 Graphical OCS Screen size 130 x 75 mm monochrome, (2) serial ports, (1) RS-232 and (1) RS-485/RS-232 port, (1) CAN port

IC752WTC502 Display Station 2000 Series - 15" active matrix XGA (1024x768) resistive touchscreen, Pentium 233 Mhz, 64 MB RAM, 6 GB HD, expansion slots, Ethernet, with unlimited point count CIMPLICITY HMI R&D and Win NT

MTR-3T43-H-R-B-M-0RR Servo Motor Metric 24V Brake

ZA81L-0001-0164 AC line filter for Alpha servo PSM-30HVi and PSM-45HVi power supply modules

20DB104A0ENNANANE PowerFlex 700S AC Drive 20D

20G1ALC750AN0NNNNN PowerFlex 755 AC Packaged Drive

25B-D010N104 PowerFlex 525 4kW (5Hp) AC Drive

2711T-15MCABLE MobileView Accessory, 15M Cable

6SE6420-2UD25-5CA1 5.5KW

TK-E02*-C 熱保護開關 0.36-0.54A 0.64-0.96A 0.95-1.45A 1.4-2.2A 2.2-3.4A

CB-50LP

PCA-6740F

Dialogic VFX/41JCT-LS

CWT PSB250Q-J3

ENP-2322C

HPCI-CPD534

PCM-5890

1492-SPM1D130-N MCB Supplementary Protector 13 A

通用型變頻器 6SE6 440-2UD31-1CA1 "11 KW,185 x 245 x 195"

20AC1P3A3AYNANC0 PowerFlex 70 AC Drive 20A

GC646MDC159 Proficy GlobalCare Complete for Logic Developer - PC & View Development/Runtime1,500 I/O

HE693DLL300 PCIF-30 Windows DLL, single license

IC600WD002 Expansion Rack I/O Cable, 2 feet (0.6m)

IC647HSTESEO750KM eSignature Option for Historian - Enterprise Server 750,000 Points (M4 Key)

IC655PWR500RR Power Supply, 6 Amp, 115/230Vac

IC694MDL646 INPUT MODULE 24 VDC 16 POINT POS/NEG LOGIC 1 MSEC FILTER

IC756WDC009E-23 DV Development Sys VB, Java, C++, English, Version 2.3

MicroLogix 1500/1769 System 1769-HSC 2/4 CHANNEL HIGH SPEED COUNTER/ENCODER MODULE

PLC-5/1771 System 1784-CP12 CABLE ASSY, 10 FT/3.2 M

Distributed I/O 1797-RPFM CONTROLNET EX FIBER REPEATER - MEDIUM

Communications D5000-6.5.7 KT DTL HP-UX SOFTWARE PROGRAMMING MANUAL

Support 9321-L3160S SUPT RENEWAL CONTRACT FOR 9321L3160

Support 9358-EP60R SUPT REINSTATEMENT CONTRACT FOR 9358EP60ENE

Support F1771-VHSCSERA FIRMWARE UPGRADE FOR 1771VHSC I/O MODULE

RSI Software Products 9324-RLD2U7ITE RSLOGIX 5000 MINI TO PRO UPGRADE, ITALIAN

RSI Software Products 9304-WVPD300DU2 UPGRADE: IN-SUPT: WINVW 256 TO WINVW PRO DEV 3000

RSI Software Products 9358-PLTM2500U4 UPGRADE: IN-SUPT: PLANTMETRICS 50 TO 100 WORKCELL

Motion Control 8720SM-063S5QAS3 63KW/117.5AMP,750 VDC,AMP AC MOTOR WITH SNS60 ENC.

A06B-0032-B075#7008 B2/3000 Servo Motor, 32K Serial Encoder

IC200TBX210 Tool box, 10 point, (IC200NDR001) 24VDC In/Relay Out, requires 24VDC Power, VersaMax SE (IC200SET001) with all software, cables (IC640VPS002)and manuals.

IC698ETM001 RX7i Ethernet Module 10/100, Auto Sensing, Auto Switching

MTR-1350-E-A-E-SRR Stepping Motor Nema34 Encoder Splashproof

ZA06B-0078-B403 B12/3000is Servo Motor, Brk, Sgt Shaft

20BD248A3ANNANC1 PowerFlex 700 AC Drive 20B

20G11RD014AA0NNNNN PowerFlex 755 AC Packaged Drive

25-FAN1-FC PowerFlex 520 Frame C Fan Kit

140XCP20000 Quantum I/O 模塊標簽

FRN3.7F1S-4C 6.8KVA 9.0A 3.7 KW 3相AC380V/50Hz/60Hz

ZC-Q2255 觸點:1開/1閉,10A 250VAC機械壽命:1000萬次?方式:下壓式

NSC400K3350 NSC400K 350A 3P

SCXI-1169

MG1500E

TRENT0N 92-005932-XXX

FSC-1811V2NA

ARK-6610

H3104A-NDNBD62

1492-RCDA4C40 Residual Current Device 40 A

6ES7153-2AR02-0XA0 IM153-2 冗余組，由 2 IM153-2 基本型和一個 IM153/IM153 總線模板組成

2098-DSD-HV100X-DN Ultra 3000 Servo Drive

GA646PME100 GlobalCare Assist for PCM Machine Edition Version 100 User

GP-0602NT-F7 GagePort LVDT NT (Full Bridge for Marposs)

IC5002TBX0130 PanelPC 12 inch Performance Unit Deluxe with Windows XP and Stainless Steel Bezel

IC647HSTAE1KM Alarm and Events Option for Historian - Standard Server 1000 Points (M4 Key)

IC647SPM001 Scheduler Plus Module

IC693MDL732RR 12/24 Vdc Output, 05 Amp, Positive Logic (8 Points)

IC756HDV001K-97 DV Development - HP/UX Op Sys Addt'l User, Korean, Version 9.7

MSI-SDK-5 SDK Connections 5 Pack

PLC-5/1771 System 1771-IM INPUT MODULE, 220V/240V AC/DC, 8 INPUT

Distributed I/O 1791D-16B0 DNET 24 VDC COMPACTBLOCK I/O, 16 IN SINK, BASE

Communications 1784-PCM4 1784-PCMK DH485 COMMUNICATION CABLE (RJ45)

Operator Interface 2706-P43R INVIEW MESSAGE DISPLAY. 1 LINE, 20 CHARACTERS

Support 9305-RSVADSITS SUPT RENEWAL CONTRACT FOR 9305RSVADSIT

Support 9515-RSEOL074R SUPT REINSTATEMENT CONTRACT FOR 9515RSEOL074ENE

EtherNet/IP Products 2711-K10C20 PV1000 COLOR KEY, ENET & RS232 PRINT

RSI Software Products 9301-2SE3403PTE RSVIEW32 RUNTIME 32K WITH RSLINX (PORTUGUESE)

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Motion Control 1326AB-B720E-M2K7L MOTOR,SERVO,460V,30.9NM,3500RPM,MULTI,BRK,IP67

4161-6-24-N12 BCD TO 7 SEG DISPLAY. 6 DIGIT. 24 VDC. NEMA 12

HMI-CCT-301 BACKLIGHT TUBE 10.5" STN QPI3 Series (QPI-3xxxx-Sxx)

IC693CPU313 5-Slot Base With Turbo CPU in base (.6 msec), 1K Registers, (12K Bytes User Program)

SFW-CCSD-6-0.2 CCS for Windows Software v6.0 CD-ROM

TRM-21006676 IMC controller I/O connector

20BD-DB1-2 PowerFlex 700 Dynamic Brake Resistor Kit

20F1ANF212AN0NNNNN PowerFlex 753 AC Packaged Drive

22B-E6P6C104 PowerFlex 40 4 kW (5 Hp) AC Drive

140EHC10500 Quantum 高速計數模塊, 35kHz@5 VDC, 5通道

284G-FVD2P3D-10-RRG-CBG-DB1-EMI ArmorStart 284 Controller

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1746-IB16 24VDC 16點輸入模塊 匯流

PXI-6225

IPC-6114P12

MDP3MP-P00-OE5F

4BW00166C1X10

A-822PGH/A-822PGL

IMBA-H61A

1492-MS5X9 IEC 5 x 9 mm Marker Card

1495-N67 Protective Fuse Cover

行程開關 3SE53120SG11

CP6B-0WEB-0070-AZ Shielded motor power cable for B22is motor (straight connector). 7 meters

GF-AB.01V Connecting FlashCable to Analog Bipolar +/-.01 V (No connector).

IC200UEX012-24 Qty of 24, 14 point expansion. (8) 24VDC In, (6) Relay Out, 24VDC Pow er Supply (includes IC200CBL501)

IC647ADMM "ADM:Azonix uMAC 1050, 1060, 6000"

IC647PCM010 Proficy Change Management Server - 10 Concurrent Users

IC693CBL328 Cable, Right Side, One - 24 Pin 90 Degree Connector, 3 Meter

IC754BEZ06GAS Replacement Gasket for 6-In SSteel Bezel

IMC-31CE-2-MODRR IMC-D Series Servo Motor Controller, Enhanced, 12 Amp

SLC/1746 System 9399-RL50GRPT RSLOGIX 500 GETTING RESULTS GUIDE (PORTUGUESE)

Distributed I/O

Application-specific products 1404-M805A-RIO-02 MASTER MODULE-PQ RIO COM-120/240V P/S-CLASS0.2

Operator Interface 2711-K10G8L1 PV1000 GRAYSCALE KEY, DH+ & RS232 PRINT

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Support 9381-P500ENR SUPT REINSTATEMENT CONTRACT FOR 9381P500EN

DeviceNet Products 1790-7CMCBL LDX I/O REPLACEMENT RIBBON CABLE, 7CM (LOTS OF 5)

RSI Software Products 9301-2SE3300PTE RSVIEW32 RUNTIME 1500 (PORTUGUESE)

RSI Software Products 9358-EPBKY01ENE RSBIZWARE EPROCEDURE BACKUP KEY 1 UNIT

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Motion Control 9101-0402 CONNECTOR KIT, MOTOR ENCODER, F/H, 90 DEG

GQPJ2D100L2P/S QUICKPANEL JR. MONO 5" WITH ADHESIVE GE LABEL

IC646MRC300 Logic PC & View 300 Tag Runtime System

MTR-3T21-G-R-0-M-S MTR-Series Servo Motor, Resolver, Metric, Seal