UR6GH UR6GHUR6GH UR6GH

 PLC的外部設(shè)備主要是指控制系統(tǒng)中的輸入輸出設(shè)備，其中輸人設(shè)備是對(duì)系統(tǒng)發(fā)出各種控制信號(hào)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)或傳感器信號(hào)）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(xiàn)圈"通電，則程序中所有該繼電器的觸點(diǎn)都動(dòng)作。輸入繼電器作為PLC接收外部主令信號(hào)的器件，通過(guò)接線(xiàn)與外部輸入設(shè)備相，其"線(xiàn)圈"狀態(tài)只能由外部輸入信號(hào)驅(qū)動(dòng)。

鄭娟萍

廈門(mén)仲鑫航自動(dòng)化設(shè)備有限公司 

 PLC的各種功能主要是通過(guò)運(yùn)行控制程序來(lái)實(shí)現(xiàn)。編制程序時(shí)，需要合理使用PLC提供的編程元件（即軟元件）。FPO型PLC中常用的編程元件有兩種：位元件（bit）和字元件（word）。位元件實(shí)際上是PLC內(nèi)存區(qū)域所提供的一個(gè)二進(jìn)制位單元，又被稱(chēng)為軟繼電器，主要用作基本順序指令的編程元件，如輸入繼電器Xn、輸出繼電器Yn、內(nèi)部通用繼電器Rn、定時(shí)（計(jì)數(shù)）器等，其參與控制的方式主要是通過(guò)對(duì)應(yīng)觸點(diǎn)的通斷狀態(tài)改變影響邏輯運(yùn)算結(jié)果即輸出。

    字元件則為PLC內(nèi)存區(qū)域內(nèi)的一個(gè)字單元（16bit），主要用作功能指令和高級(jí)指令的編程元件，通常用以存放數(shù)據(jù)，如數(shù)據(jù)寄存器DTn，定時(shí)(計(jì)數(shù))器的設(shè)定值SVn、經(jīng)過(guò)值EVn等。字元件沒(méi)有觸點(diǎn)，通常以整體內(nèi)容參與控制。

Banner PBD Power Block For Multi-Beam PBD 16390 New

NEW VEEDER ROOT 778311-121 PROXIMITY SWITCH 150mA

Rieter Proximity Switch 24V 18412170024024 0920-2328 09202328

NEW THERMOID 20MM TIMING BELT 1200 RPP8 1200RPP8

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NEW DALTON SPRING TORQUE LIMITER 0SD-900 OSD900

KEB "KN" 16-083-25620 LIMIT ROLLER HEAD NEW 

Allen Bradley 195-BA01 Auxiliary Switch 195BA01 Ser. A

Parker SS14 & 40 Valve Kit PS5395 PS-5395 New

No Name Timing Belt T5-500 T5500 T5 500 New 

GOULD MODICON B552 10-48 VDC OUTPUT MODULE

Murr Elektronik Female Connector w/ Connector 7000-12321-6230500 New

NEW APPLETON EXPLOSION PROOF JUNCTION BOX GUB-1 GUB1

Johnson Controls Pressure Control Switch P70HA-2 P70HA2 40-100 PSIG New

RED LION LMPEC000 3 PIN LOGIC MAGNETIC PICKUP EMITTER FOLLER NEW 

Red Lion Inligent Meter IMP20060 120/240 VAC New

NEW RITTAL FLAT BRACKET ENCLOSURE CONNECTION KIT PS4582500 600347 

Fanuc LTD Discharge Unit A06B-6050-H050 A06B6050H050 Used

GE MOLDER MOLDED COVER ASSEMBLY 546A780G054 NEW

Giddings & Lewis DC Input 501-03202-00 502-02814-16

JOSLYN CLARK COIL TB-137-13 TB 137 13 TB13713 240V.D.C. 

PTC Dual 999018-001 Powerlithic Modules on Heat Sink 41180-002

SQUARE D 1S1F 1KVA 1 KVA 115C TYPE S 480/240 (HV) 240/120 (LV) 1PH TRANSFORMER

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HERAEUS 834010 177 1750W 450V NEW PROCESS LAMP LIGHT 

LFE 2011 C5-5020-4300 PROCESS CONTROLLER  

No Name 274731 Heater 274-731 New

New D&R Lamps Miniature Lamp Bulb Model 259 Lot of 20 

NEW LOT OF 10 HALEX 90° LIQUID TIGHT CONNECTOR 16907B 3/4"

Acra Electric Heaters 4-92 175 watt 250 volt 10" x 3"

Allen Bradley Elect Interlock 40495-455-04 4049545504

IRION & VOSSELER ENCODER 112082-01 11208201 

SIRCO CHLORIDE POWER PROTECTION SWITCH VM1 125A 125A 125 A AMP 3 POLE  VM1125A 

Apollo Conbraco 1" 3 PC. Ball Valve Service Kit 82-005-01 8200501 Lot of 2 New

PARKER COIL  CF4C05 120V VOLT 04F20C2110ACF 11W WATTS 

Crouzet I/O Module IDC5Q 84112210 10-60 VDC 50mA Lot of 2 Used

DYNISCO TPT432A-5C-6/18 PRESSURE TRANSDUCER 0-500 PSI

New ACI Motor Brush Lot of 4 234 2-1/2" x 1"x 5/8"

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METTLER TOLEDO MAIN INTERFACE DISPLAY CIRCUIT BOARD B140111 A12885800A 12885800A

(PACK OF 2) NO NAME 43884-0020 438840020 30VDC SURGE SUPPRESSOR NEW 

MURR ELEKTRONIK 21003-001 600 VOLTS 13 AMPS NEW

STI SCIENTIFIC TECH MINISAFE B LIGHT CURTAIN 36" RECEIVER MS4336B-2 MS4300B-2

STI miniSafe Light Curtain Receiver MS4312 New

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PPE Heat Band 66301-B 66301B 400W 460V Lot of 2

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PPE Heat Band 66301-B 66301B 400W 460V Lot of 2

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PNEUMATIC G1019060/012 Filter G1019060012

John Crane Seal 81175 1.875" New

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NEW POWERWARE P17P7249 200-240VAC POWER CABLE PC-UN ASSEMBLY 12 AMP A 12A 

KRALOY 12"x12"x4" NON-METALLIC PVC PLASTIC ELECTRICAL ENCLOSURE BOX

Turck Proximity Sensor Bi2-M12-AP6X 1 stuck NEW

NEW SPC TECHNOLOGY POWER SUPPLY SPC11479 

HOHNER Encoder AM-33321/550 AM33321550 5 pin NEW 

WESTINGHOUSE BREAKER FD3070L 600VAC 3 POLE

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BLINKGEBER LG.NR.4/920 437/9 W/ SAIA UDS1NJ1A1OBZ134

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LOT OF (2) PANDUIT C4LG6 WIRE DUCT COVER 6' 6FT STRIPS 4.25" WIDTH x .37" DEPTH 

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DEVAR ISOLATED SENSOR TRANSMITTER 18-115ASG 18-115A NEW

BONITRON REGEN REGENERATIVE REGENERATION MODULE 3345 M3345-46VMFM 460V 120A

Johnson Controls Platinum 10' Avg Sensor TEA-J000000 

NO NAME HCGFAR 1200 MFD 400 VDC CAPACITOR NEW

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Precision Brand Steel Shim 16670 .031 Gauge 12" x 120"

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Fast Heat Heat Band Lot of 2 BB022176 500W 240V EH PX

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Lot of 5 Appleton Conduit Fitting CN-200 2" NPT New

SIEMENS W0816B1200CT 200A 208-120/240 OUTDOOR LOAD CENTER BREAKER PANELBOARD NIB

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New 3M Connector Ejector Header 3433 50 Pin

NEW LOT OF 2 BURNDY CABLE CLAMP UTG14AC SIZE SZ 14

PHILIPS ECG COMPONENT 128 ECG128 TRANSISTOR NEW 

New Fast Heat Band Lot of 2 BM023786 700W 240V HP

OPTO 22 Output Relay OAC5 Lot of 2 Used

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YASKAWA YASNAC ERC ROBOTICS ROBOT CONTROL STATION OPERATOR JZNC-OP111B P/N: 75

BARBER-COLMAN TEMPERATURE CONTROLLER 570 5743-09030-430

emecanique Altivar Ac Drive ATV452U75S Series 45-2 10 hp 10hp 575v 11a 16.5a

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NEW TRI-TRONICS FIBER OPTIC MODE SENSOR UCFR-A UCFRA 

Allen Bradley 2711 Memory Card Retainer 77135-146-52  7713514652 New

RELIANCE ELECTRIC RESOLVER INPUT MODULE 57411-2 0-57411-2E 0574112E

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ADALET 3-3/16" EXPLOSION PROOF ENCLOSURE 1/2" XIHDGCX-2

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LOT of 10 Festo QST-6-4 Push in T Connectors NEW

NEW LOT OF 3 SOUTH LAND CARBON MOTOR BRUSH 21342 E3 1-3/8"L 25/32"W 1/2"TH

Electronic Enterprises Electronic Electron Vacuum Tube 6Y6GA 7 PIN New

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NEW B&G THERMOMATE OPERATOR 6'6" REMOTE SENSING BULB TM61 109302

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EUROTHERM PARKER SSD 590 AC DRIVE MODULE 6011-P-00 6011P00

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NEW LOT OF 44 NO NAME TEST PROBE 600042 

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NEW GE BALLAST 8G1713F CLASS P .38AMP A .38A  118Volt 8G1713

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ELECTRONICS CORP UV EYE 45UV6 1009 45UV61009 45UV6-1009

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HTM ELECTRONICS CATEGORY 4 SAFETY 46" LIGHT CURTAIN SE4 30-120-PP 24V