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PLC的發(fā)展趨勢
    隨著PLC應(yīng)用領(lǐng)域日益擴大，PLC技術(shù)及其產(chǎn)品結(jié)構(gòu)都在不斷改進(jìn)，功能日益強大，性價比越來越高。

    （1）、在產(chǎn)品規(guī)模方面，向兩極發(fā)展。一方面，大力發(fā)展速度更快、性價比更高的小型和超小型PLC。以適應(yīng)單機及小型自動控制的需要。另一方面，向高速度、大容量、技術(shù)完善的大型PLC方向發(fā)展。隨著復(fù)雜系統(tǒng)控制的要求越來越高和微處理器與計算機技術(shù)的不斷發(fā)展，人們對PLC的信息處理速度要求也越來越高，要求用戶存儲器容量也越來越大。
    （2）、向通信網(wǎng)絡(luò)化發(fā)展
    PLC網(wǎng)絡(luò)控制是當(dāng)前控制系統(tǒng)和PLC技術(shù)發(fā)展的潮流。PLC與PLC之間的聯(lián)網(wǎng)通信、PLC與上位計算機的聯(lián)網(wǎng)通信已得到廣泛應(yīng)用。目前，PLC制造商都在發(fā)展自己的通信模塊和通信軟件以加強PLC的聯(lián)網(wǎng)能力。各PLC制造商之間也在協(xié)商通用的通信標(biāo)準(zhǔn)，以構(gòu)成更大的網(wǎng)絡(luò)系統(tǒng)。PLC已成為集散控制系統(tǒng)（DCS）*的組成部分。
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鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司

（3）、向模塊化、智能化發(fā)展
    為滿足工業(yè)自動化各種控制系統(tǒng)的需要，近年來，PLC廠家先后開發(fā)了不少新器件和模塊，如智能I/O模塊、溫度控制模塊和專門用于檢測PLC外部故障的智能模塊等，這些模塊的開發(fā)和應(yīng)用不僅增強了功能，擴展了PLC的應(yīng)用范圍，還提高了系統(tǒng)的可靠性。
    （4）、編程語言和編程工具的多樣化和標(biāo)準(zhǔn)化
    多種編程語言的并存、互補與發(fā)展是PLC軟件進(jìn)步的一種趨勢。 PLC廠家在使硬件及編程工具換代頻繁、豐富多樣、功能提高的同時，日益向MAP(制造自動化協(xié)議)靠攏，使PLC的基本部件，包括輸入輸出模塊、通信協(xié)議、編程語言和編程工具等方面的技術(shù)規(guī)范化和標(biāo)準(zhǔn)化。

PHOENIX IB IL 24 DI 4 TERMINAL BLOCK INLINE DIGITAL 4INPUT 24VDC(LOT OF 2 *XLNT*

RELIANCE ELECTRIC RH4B-UL 120VAC RELAY 10A 30VDC (LOT OF 4) ***XLNT***

TCI KLR35ATB KLR SERIES THREE PHASE REACTOR 35A 600V ***XLNT***

PHOENIX IB IL 120 DI 1 TERMINAL BLOCK INLINE POWER 120VAC  **XLNT**

INTERBUS IB STTB 120/130 DO 8/3-1A  **XLNT**

GE SRPF250A90 CIRCUIT BREAKER ***NIB***

PHOENIX INTERBUS IB IL DO 4 AC-1A INTERBUS INLINE TERMINAL 1AMP 12-253VAC *XLNT*

PHOENIX INTERBUS IB IL 120 PWR IN TERMINAL BLOCK INLINE POWER 120VAC **XLNT**

INTERBUS IB STME 24 BDI 16/4 INPUT MODULE 16POINT DIGITAL 24VDC **XLNT**

ALLEN BRADLEY 700-HA33A1 120VAC SER A GENERAL PURPOSE RELAY (LOT OF 2) **XLNT**

MAREL A004787 CONTROL CABINET NETWORK SERVER **XLNT**

INTERBUS IB STME 24 BK-T 24VDC CONTACT **XLNT**

INTERBUS 2719315 IB STME 120/230 DO 8/3 PHOENIX CONTACT **XLNT**

ALLEN BRADLEY 709-FOD SIZE 5 SER K 600V 3-2PH STARTER **XLNT**

SQUARE D H361 SAFETY DISCONNECT SWITCH (ENCLOSURE ONLY)  **XLNT**

ALLEN BRADLEY 100-A09ND3 CONTACTOR SER B  660V 5.5KW 9A (LOT OF 3) **XLNT**

EMECANIQUE XCK-T121 LIMIT SWITCH W/ ROLLER 240VAC 10AMP ***XLNT***

GOULD SHAWMUT 67583 ALUMINUM POWER DIST BLOCK 3 POLE **XLNT** 

LENZE 7042 P2 PC BOARD W/ I/O  **XLNT**

NIBCO W910B 2.5" SILENT WAFFER CHECK VALVE 2-1/2" FIG ***NIB***

SOLA SOLIDS 84-05-150 INPUT 115VAC OUTPUT 5VDC POWER SUPPLY ***XLNT***

DEIF H0350/5 100 AMP METER GAUGE ***XLNT***

RIDGID B-294 FOOTSWITCH 15A-125 250VAC **NNB**

DEIF 40350/1 TRANSFORMER VOLT METER GAUGE ***XLNT***

ACCU-SORT SYSTEMS 95020406 OPERATOR INTERFACE PANEL ***XLNT***

RELIANCE ELECTRIC BLS-S5-5-G8-05 BALLUFF DATA SENSOR ***XLNT***

SQUARE D HU361DS STAINLESS STEEL SAFETY SWITCH (ENCLOSURE ONLY)  ***XLNT***

EMECANIQUE XVA-C03 400MM BANK AND BEACON TUBE  ***NNB***

DAYTON 2C362 FAN BLADE 18" DIAMETER 3 BLADE   ***NNB***

FMI RP-G50 METERING LAB PUMP **XLNT**

CUTLER HAMMER A30CDA0 ENCLOSURE MOTOR STARTER 460/575V 10HP   ***XLNT***

CUTLER HAMMER WMS1D30 D30 CIRCUIT BREAKER 240V 5A 1POLE (LOT OF 2) **XLNT**

EMECANIQUE LC2D0910 REVERSING CONTACTOR 750V 25A **XLNT**

ELLIOTT 64B 4"-5"-6" COPPER GROUNDING CLAMP (LOT OF 4) **NNB**

CUTLER HAMMER WMS1D20 D20 CIRCUIT BREAKER 240V 5A 1POLE (LOT OF 6) **XLNT**

CUTLER HAMMER WMS1D05 D5 CIRCUIT BREAKER 240V 5A 1POLE (LOT OF 5) **XLNT**

FCI 12-64-4/1"/2"U/SW/L 5281-W-ADFH NEMA TYPE 3 BASIC FLOW SWITCH  **XLNT**

FCI 12-64-4/1.5 NEMA TYPE 3 BASIC FLOW SWITCH **XLNT**

MICRO MOTION 1000555-REV H KEYPAD INTERFACE BOARD FOR DMS1-NA-1-C-SP  *XLNT*

MICRO MOTION 0261401 REVV E PCB BOARD FOR DMS1-NA-1-C-SP  *XLNT*

MICRO MOTION 0265201 REV C POWER BOARD FOR DMS1-NA-1-C-SP  **XLNT**

DURANT/EATON 58841-401 COUNTER CONTROL INTERFACE ***XLNT***

UM 49407-072 140PSI 100 DEGRESS F. VACUUM TANK  **XLNT**

MICRO MOTION 026850 PCB BOARD FOR DMS1-NA-1-C-SP  *XLNT*

MICRO MOTION DMS1-NA-1-C-SP DENSITY MONITORING SYSTEM 115VAC DAMAGED DISP *XLNT*

MICRO MOTION DMS1-NA-1-C-SP DENSITY MONITORING SYSTEM 115VAC ****XLNT****

DODGE/RELIANCE F4BLT7108 BUSHING ***NIB***

PARKER AC61-2 ACTUATOR VALVE 150PSI 10 BAR ***NIB***

MICRON 55-406304-3181 SERVO MOTOR 1:2 RATIO *NIB*

PARKER P3NRA96BNG P3N 3/4" REGULATOR   ****NIB****

PARKER/HYDRAULIK D1VA1C 70 DIRECTIONAL CONTROL VALVE 5000PSI/345 BAR MAX **NIB**

HUBBELL 2210-142CC13FS PILOT DUTY SPEED SWITCH **XLNT**

WATTS 263A-1-25 COMPACT WATER PRESSURE REGULATOR 1/4 ***XLNT***

WATLOW 999D-12KK-JDRG TEMP CONTROL MULTI LOOP LIMIT PROCESS ***XLNT***

SOLA SLS-24-036T POWER SUPPLY 24VDC 3.6A ***XLNT***

OMRON CS1W-ID231 INPUT MODULE CS1 DC24V 32POINT 6MA  ***XLNT***

OMRON CS1W-OD212 OUTPUT MODULE 0.5/2.5AMP 16POINT 24VDC   ***XLNT***

OMRON CS1W-V600C11 ID SENSOR UNIT ***XLNT***

PACKARD 7601727 130V 2A 60HZ TEMP CONTROLLER ***XLNT***

VWR SCIENTIFIC 13259-034 HEATBLOCK III 120VAC 200WATT 50/60HZ ***XLNT***

KLEINKNECHT LE 10.078 A3 UJ 2000 RELAY MODULE **NNB**

KLEINKNECHT LE 10.078 A4 UJ 2000 RELAY MODULE **NNB**

IPC ISSC 90CPCC ICP 90 PROGRAMMABLE CONTROLLER 115/220V   ***XLNT***

MITSUBISHI FR-APB COMPUTER LINK MODULE ***XLNT***

GLOBALTEC 951048 CFM 80D CRIMP FORCE MONITOR ****XLNT****

HONEYWELL C637B1002 GAS PRESSURE SWITCH 5PSI  ****XLNT****

EMERSON 02-783406-10 D MOTHERBOARD  ****XLNT****

MITUTOYO 905409 SPC CONNECTING CABLE 80"  **NIB**

GAGETALKER GP62453 DIGITAL GAGEPORT VERSION 2.4 H/W G**XLNT**

GAGETALKER GP50900 GP 2102NT DIGITAL GAGEPORT ***XLNT***

GRALEX 301-3-1 DIGITAL PANEL METER **NIB**

SQUARE D KXBB07 POTENTIOMETER **NIB**

FAZ G1A CIRCUIT BREAKER 220/380 AC **XLNT**

LENZE 742E3 MAIN PC BOARD **XLNT**

LENZE 7043P1 5/7050/0140 PC BOARD W/ I/O  **XLNT**

WOODS PC132 E-TRAC CONTROL MODULE **XLNT**

LITFUSE L60030C-1PQ 600V 30A FUSE HOLDER (LOT OF 4)***XLNT***

SQUARE D K250D1 INDUSTRIAL CONTROL TRANSFORMER***XLNT***

SIEMENS 6DD1-684-0DC0/6DD1684-0DC0/465 684 9032.00 PSV/ATV CABLE ***NIB***

OPTA5 INPUT/OUTPUT CARD FOR MFG HVX9000 SERIES***XLNT***

EUROTHERM 385851 ISSUE 3 DRIVE SUPPLY BOARD 590 SERIES***XLNT***

HONEYWELL CXS0010HPV32G2I1 AC DRIVE 1HP 208-240V (FOR PARTS) ***PARTS***

EATON SVX004A1-2A1B1 4HP AC DRIVE 17.5A 220-500V ***XLNT***

TORNOS BECHLER 115910 TIMING RELAY 5130.3.015***XLNT***

FERRAZ-SOCOMEC 2410 3F 600V 16A GENERAL PURPOSE SWITCH***XLNT***

MOORE PRODUCTS 61VH VHC BOOSTER RELAY ***XLNT***

SIEMENS 6ES5 375-0LD21 SIMATIC S5 16K X 8BIT MEMORY SUBMODULE ***XLNT***

MODICON 91-01094-00 DISPLAY MONITOR 8-1/2" x 8-3/4" x 6-3/4"  ***XLNT***

MCGILL 182760;301 CAM FOLLOWER 1 3/8 SB (LOT OF 2) ***NIB***

B&R 8AC130.60-6 REV E0 PLUG IN MODULE ***XLNT***