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PLC配有多種通信接口，PLC通過這些通信接口可與編程器、打印機、其它PLC、計算機等設(shè)備實現(xiàn)通信。可組成多機系統(tǒng)或連成網(wǎng)絡(luò)，實現(xiàn)更大規(guī)模控制。
    (2）擴展接口
    用于連接I/O擴展單元和特殊功能單元。 通過擴展接口可以擴充開關(guān)量 I/O 點數(shù)和增加模擬量的I/0端子，也可配接智能單元完成特定的功能，使PLC的配置更加靈活以滿足不同控制系統(tǒng)的需要。I/0擴展接口電路采用并行接口和串行接口兩種電路形式。
    工業(yè)控制中，除了用數(shù)字量信號來控制外，有時還要用模擬量信號來進(jìn)行控制。模擬量模塊有三種：模擬量輸入模塊、模擬量輸出模塊、模擬量輸入/輸出模塊。
    (Ⅰ) 模擬量輸入模塊
    模擬量輸入模塊又稱A/D模塊，將現(xiàn)場由傳感器檢測而產(chǎn)生的連續(xù)的模擬量信號轉(zhuǎn)換成PLC的CPU可以接收的數(shù)字量，一般多為12位二進(jìn)制數(shù)，數(shù)字量位數(shù)越多的模塊，分辨率就越高。
    (Ⅱ) 模擬量輸出模塊
    模擬量輸出模塊又稱為D/A模塊，把PLC的CPU送往模擬量輸出模塊的數(shù)字量轉(zhuǎn)換成外部設(shè)備可以接收的模擬量（電壓或電流）。模擬量輸出模塊所接收的數(shù)字信號一般多為12位二進(jìn)制數(shù)，數(shù)字量位數(shù)越多的模塊，分辨率就越高。
SIEMENS,8SWA1011-0DG21, 20TERM BLOCK,SCREW,THROUGH-TYPE,4,BEIGE

SIEMENS, 52PX8A3K, PUSH BUTTON OPERATOR, FLUSH CAP, GREEN, 1NO CONTACT

3SP-SP CONTROLLER ON/OFF, LEGEND PLATE 22.5MM 16/PKG

1616440000, Z-series, Fuse terminal, Rated cross-section: 2.5 mm2, Dark Beige,

3VU9-135-1AB02, BUSBAR 63AMP LINE SIDE FEEDER 3VU9135-1AB02

SIEMENS, 3SB3930-0HA3, ILLUM. PUSHBUTTON CAP,EXT,METAL,YELE 10/PKG

SIEMENS, A1VAR001004, VARISTOR,660VRMS,250W 

8WH9000-1AA00, COVER,TERMINAL SIZE 2.5, GRAY 50/PKG

SIEMENS, 8WA1822-7EF16, G FUSE LINK,QUICK RESPONSE,1A RATED CONTINUOUS CURRENT

MARATHON, 6G38EF, END BRACKET FOR 6G38 SECTIONAL TERMINAL BLOCK; 25/BX

WEIDMULLER, 1028300000, WFF 35, TERMINAL 125AMP 1POLE 1000VAC SOLD EA

205208-1 -- AMP CRIMP SNAP PLUG ASSEMBLY 25PIN 10/PKG

3RH2911-1FA22, Auxiliary Contact Block, 2NO, 2NC

SIEMENS, 3UX1424,  Terminal Block Adaptor For 3ua60

3RA1941-1AA00 --CONNECTING MODULE FOR 3RV1.4 AND 3RT1.4,

SIEMENS, 3RH2921-1DA20, LATERAL AUX. SWITCH BLOCK, 2NO, FOR MOTO

8WH9020-6BC10, BRIDGE, 2-POLE, FOR TERM WIDTH 5.2 MM 50/PKG

SIEMENS, 5SX2102-8, SUPPLEMENTARY PROTECTOR,1P,2A,CURVED,  5SX21028

6SY9904, SIMODRIVE 611-A/D ELECTRONIC PLUG-IN TERMINAL, FOR MOTOR CONNE (3-POL)

SIEMENS FURNAS 49ASN0 - AUXILIARY CONTACT N 0.KIT ESP100

3SB3501-0BA21,PUSHBUTTON,MOM,RED,EXTND,OP,RND-MTL 

FRS-R-2 --FUSE, 2A, 600V, TIME DELAY; VOLTAGE RATING VDC:250V; VRATING VAC:600V

Siemens,3SB36031CB61,40MM Red Push-Pull Pushbutton, 3SB3603-1CB61

5SX2-105-7, SUPPLEMENTARY PROTECTOR,1P,0.5A,CURVE C

SIEMENS, CCE125, MCCB 125A COMPRESSION LUG KIT

Siemens, HPLP, Handle Padlock Device, NIB, VL Breaker

SIEMENS, 3SB03-PFG10, PUSHBUTTON GREEN MOM FLUSH 2POS, 3SB03PFG10

 6ES5-497-4UB22 Siemens CONNECTOR-4 SCREW 454 2SLOT(O)

SIEMENS, 3SB3400-1D, BA9S WITH 24V INCANDESCENT LAMP LAMPHOLDER, 3SB34001D

SIEMENS, 7NG3090-8AV, COLD JUNCTION TERMINAL

SIEMENS, 3SB3001-6BA00 EPILOT LIGHT,N/A,AMB,RINGS,OP,RND-PLSTC 3SB30016BA00

SIEMEN, 3RK1-903-0AA00, MODULE TERM DS ET200S PMD FOR PWR MOD

WEIDMULLER, 1683680000, Z-series, End plate, Partition plate,  49/PKG

SIEMENS, 3RH2911-1HA12, AUX. SWITCH 1NO+2NC FOR S00 & S0 SCREW

Siemens 52RB3E4 Mushroom Head Cap, Plastic, Set Screw, 2-1/2" Head, Yellow 

SIEMENS  3UA5000-1G, FURNAS ELECTRIC CO OVERLOAD RELAY 4-6.3AMP

SIEMENS, 3RH1911-1HA12, AUX SWITCH BLOCK

3RH2911-1DA20, AUX. SWITCH LATERAL 2NO FOR S00 SCREW NEW IN BOX

3RV2901-4E, TRANSVERSE AUX. SW 1NO+1NC RING LUG 

8WA1305, TERMINAL BLOCK,3-TERM,48MM,120A,600

CARLO GAVAZZI  CGC-9A-24  3P CONTACTOR W/1NO1NC 24VAC, CGC-9A

U70507, Fuseblock, 2-P, 50A/750V, 14x51mm Box Lug Wire Terminals, 2-14AWG

52AEE4 -- REPLACEMENT LAMP LED-YELLOW, 120 VOLT

Siemens,3SB02-P3BP, 22MM Push Button, 30MM M-Room, Blck, 3SB02P3BP

Siemens,3SB3500-2SB61,Red Selector Switch, 3 Positions, 3SB35002SB61

3RV1913-1DA00 / 3RV1913-1D N & PE TERM., 72MM PROTECTION IP55, WALL MOUNTING

6ES5-497-4UB42 SIEMENS 490 FRONT CONNECTOR,20-PIN,SCREW,SPARE 

7431-0048, ft RS-232 cable w/DE9S connector 

5SY6104-7, CIRCUIT BREAKER,1P,4A,CURVE C

SIEMENS, A1-101-531-201, MOUNTING KIT, RESISTORS,2-HIGH MTG, A1101531201

SIEMENS, TSSL3, BREAKER VL TRML SHIELD STD 3P L-FR 600

SIEMENS, A1108031501, FLAT CABLE AY,64 CKT

EPCOS, B80K550-ND, VARISTOR 910V 100KA CHASSIS

SIEMENS, 3RH2911-1HA21, AUX. SWITCH 2NO+1NC FOR S00 & S0 SCREW

SIEMENS, 3RH2911-1HA30, AUX. SWITCH 3NO FOR S0 SCREW 

SIEMENS, 3RH2911-1GA31, AUX. SWITCH 3NO+1NC FOR S00 SCREW 

SIEMENS, 3RH2911-1DA02, AUX. SWITCH LATERAL 2NC S00+S0 SCREW

SIEMENS, 6SE7090-0XX84-2FA0, PANEL OPERATOR PARAMETER AY PMU KEYPAD

SIEMENS, TA2JG250, BREAKER VL LUG CU/AL 250KCMIL J-FR ACC 3/pkg

SIEMENS, 3TX7120-1DC13, RELAY 10AMP 24VAC 8PIN OCTAL

0518960011,  DEK 6 FWZ 11-20,  Terminal markers, Card, 5 x 6 mm, 50/CARD 10/BX

8WH9130-0MA00, TERMINAL,SHIELD,TERM SIZE 14 FOR BUSBAR

3RH2911-1HA31, Auxillary Contact, screw terminal, NO+1NC

SIEMENS, 3RH2911-1DA11, AUX. SWITCH LATERAL 1NO+1NC S00 SCREW- NEW IN BOX

A50P20-1, 500 Volt 20 Amp Current Limiting,Very Fast Acting Semiconductor Fuse

U70507, Fuseblock, 2-P, 50A/750V, 14x51mm Box Lug Wire Terminals, 2-14AWG

SIEMENS 3TX7144-1E5 RELAY SOCKET, DIN RAIL MOUNT, 300V@10AMP, 14PIN

3RH1131-1JB40 - CONTROL RELAY,3NO,1NC,24VDC COIL,SCREW

BUSSMANN BY EATON  NOS-30  FUSE, 30A, 600V

SIEMENS, 52AEB3, ACCESSORY, LED,GREEN 6V, LAMP

5SX2-101-8 / 5SX2101-8 SUPPLEMENTARY PROTECTOR,1P,1A,CURVE D CURCUIT BREAKER

FERRAZ, GGM610, 250V 6/10A 5X20MM FUSEGGM6/10

SIEMENS, 3RH2921-1DA11, AUX. SWITCH LATERAL 1NO+1NC S0 SCREW,

Philips - TUV 15W G15T8 Air/Water Treatment Germicidal UV Light Bulb

SIEMENS, 3TX4440-0A, AUX. CONTACT BLOCK,4NO,W/SCREW TERMINALS

THOMAS&BETTS, 256-30695-1403, 400 WELD CU. STD. BRL. 1 HOLE 3/8"B 

SIEMENS, 3RH2911-1GA13, AUX. SWITCH 1NO+3NC FOR S00 SCREW 

SIEMENS, 8WA1-857, INSULATING MOUNTING BLOCK, INCLUDES SCREWS, BEIGE (6/PKG)

SIEMENS, 3RH2921-1DA02, AUX. SWITCH LATERAL 2NC S0 SCREW

SIEMENS, 5ST3011 AUXILIARY SWITCH 14AMP 2NO UR 440V 

Siemens 3SB3257-0AA61 Pushbutton Unit, WHITE

3SB3203-1HA20 - E-stop button, 40mm, twist, w/ cont block

FS106C -- SLEEVE FEMALE SCREW TERMINAL INSERT 6P + GROUND

SIEMENS, 3SB3240-6BA60, PILOT LIGHT,WHT,FV, LED,130V,RINGS,CMPLT, 3SB3240-6BA60

52PA8B3, Switch,Extended push button Mom.; Green; Chrome mounting nut; 30 mm

LBRS120, SHAFT EXTENSION 120MM LONG

Siemens 3SB3245-0AA41 Pushbutton Unit,  Green

3SB36020AA51, PUSH BUTTON ACTUATOR,ROUND,METAL,22MM,COMBINATION

SIEMENS  6ES7193-4CK20-0AA0, SIMATIC DP, TERM MOD TM-P30S44-A0, 6ES71934CK200AA0

SIEMENS, 9WH2000-0AH00, TERM BLOCK,SPRNG LOAD,THRU-TYPE,6,GRAY 43/PKG

Siemens, 3RU1116-0JB0,.7-1 AMP OVERLOAD RELAY, 3RU11160JB0

SIEMENS, 52AEB2, ACCESSORY, LED LAMP ,RED 6V

SIEMENS FURNAS OVERLOAD RELAY 3UA70 10-1B 3UA70101B PLC /3UA7010-1B

IEMENS, 5ST2143, BUSBAR, 210 MM L 2 PHASE 65 or 120 AMPERE COPPER BUSBAR

Siemens, 3RP1511-1AQ30

SIEMENS, 3SE3200-6XX03, MOLDED POSITION SWITCH, 3SE32006XX03

SIEMENS, 5SX2102-8, SUPPLEMENTARY PROTECTOR,1P,2A,CURVED,  5SX21028

TEXAS INSTRUMENTS, 6MT14-40GL, DC OUTPUT MODULE

AMP-TRAP, AJT-7, 600V 7A CLASS J TD FUSE  7/PKG

SIEMENS, 3TX7-402-3T, SURGE SUPPRESSOR,127-240VAC,150-250VDC

SIEMENS, 3RU2126-1AB0, OVERLOAD RELAY 1.1.1.6 A FOR MOTOR PRO 

SIEMENS, 3RV1935-5A, MSP S2 LINE TERMINAL,TOP

SIEMENS, 6FX2003-7BX00, MOUNTING FLANGE F. CONN SZ 1.

Weidmüller, 9025860000, Wire end ferrule, 0.75 mm2, 10 mm, White

SIEMENS, A1101531200, MOUNTING KIT, RESISTORS, 1-HIGH MTG 

SIEMENS, 52PA8B2K, PUSH BUTTON OPERATOR, EXTENDED CAP, RED, 1 NO

SIEMENS, 3UA5500-1C, OVERLOAD RELAY 1.6-2.5AMP 1NO/1NC 150V

FERRAZ SHAWMUT, A70P100-4, AMP-TRAP, SEMICONDUCTOR, 100 A, 700 VAC, 650 VDC

SIEMENS 8WH30200AE00 - TERMINAL BLOCK, IDC, 2-TIER, 1.5, GRAY, 2-POLES 10/PKG

SIEMENS 8WH20000AH00 - TERMINAL BLOCK, SPRING LOAD, THRU-TYPE, 6, GRAY 32/BX

Siemens 52PA8A2 Heavy Duty Pushbutton, Flush Cap, Red

5SX2116-8 - CIRCUIT BREAKER, 1P,16A,CURVE D

3RA2913-2BB1 -- WIRING KIT ELEC & MECH FOR WDS S00 SCREW

5SY4103-5 -- SUPPLEMENTARY PROTECTOR,1P,3A,CURVE A

Siemens, 3RV19353B,  MSP S2 BUS For 3+Accessories

Siemens, 5SX9360, Shunt Release F. for MCB's 5SX6 & 7 

Siemens,8WA2011-1SG23, Term Block,Sprng Load,Fuse, 10/PKG,  8WA20111SG23

3SB3652-6BA30 / 3SB36526BA30, PILOT LIGHT,YLW,FV, LED,230V,RINGS,CMPLT 

6ES5490-7LB11, CONNECTOR FRONT S5-115 24 PIN SCREW 

SIEMENS, 3RU2126-1EB0, OVERLOAD RELAY 2.8.4.0 A FOR MOTOR PRO 

SIEMENS, 3RU2116-0JB0, OVERLOAD RELAY 0.70.1.0 A FOR MOTOR PR 

SIEMENS, 52PB9D1K Heavy Duty Mushroom PushButton Unit, Assembled Contact Block

SIEMENS, 6FX2003-7DX00, MOUNTING FLANGE F. SIGNAL CABLE 

SIEMENS, 3RH2911-1GA22, AUX. SWITCH 2NO+2NC FOR S00 SCREW 

SIEMENS, 5SX2102-7, CIRCUIT BREAKER 2AMP 1POLE 230/400VAC C-CURVE

051896001, NIB!!  TERMINAL MARKER 5X6MM WHITE 1-10 50/CARD  10/BX DEK6FWZ1-10

8WH9003-1GA00, COVER, TERMINAL SIZE 4 50/PKG

3RA1942-2E, CONTACTOR BASEPLAT-SIDE BY SIDE S3,S3,S2

SIEMENS, 8WA1011-1PG00, GROUND TERMINAL BLOCK, 600 V, 18-10 AWG, G/Y (11/PKG)

6SL3-060-4AM00-0AA0, D-CLIQ CABLE,IP20/20-PREFAB,0.36M(1.2FT)

SIEMENS 8WH30200AE00 - TERMINAL BLOCK, GRAY, 2-POLES 50/BX 8WH3020-0AE00  NIB!

52NL02 Heavy Duty Legend Plate, Water and Oil Tight, 52, 1-7/16" Height, 2" Widt

60608T - 3-Pole Fuse Block for 600 Volt 31 to 60 Amp Class T Fuses

5SX2350-7 -CIRCUIT BREAKER T55 400V, 6KA, 3-POLE,

3SB3001-1DA31 -- Illuminated mushroom push-button switches, 3SB30 series

SIEMENS, 52SA2EAB, SEL SWITCH,MNTD,SHT LVR,3POSECAM

CONTROS CONCEPTS, SSO3-SHWE-NO/NO, 30MM 3 POS SELECTOR SWITCH

Siemens 52PX8A3 Pushbutton Operator, Black Max Corrosion Resistant,  GREEN

Siemens 3SB3245-0AA31 Pushbutton Unit

SIEMENS, 6RY17050AA02, TSE RESISTOR 2 X 15R +-5 PERCENT ,6RA70

SIEMENS, 3RG4112-3AG01, PROXIMITY SWITCH IND BERO 15-34VDC PNP NO

SIEMENS, 3SB3245-0AA61. PUSHBUTTON,MOM,WHT,FLSH,CPLT,RND-PLSTC
PPO-PPMCRD-NC, Push-Button Sw, 2-Position Push-Pull Red Maint w/1NC Contact Blk

SIEMENS, 52AED37,ACCESSORY, 7 CLUSTER LED,GREEN,24V

SIEMENS, 52AEB37, ACCESSORY, 6 CLUSTER LED,GREEN,6V, LAMP

Siemens, 3SB36406BA60, 3SB3640-6BA60, White Pilot Light, LED,120V

WIELAND, P/N 71.325.1628.0, OPEN BOTTOM HOUSING, SIZE 16 AL ALLOY

SIEMENS 3TX7014-1BE00 - RELAY, 115VUC, 1CO

SHURITE, 7305Z, CURRENT MTR; FUNCTION:DC MILLIAMPS; METER RANGE:0MA TO 25MA

LN-502, THOMAS & BETTS  LN502  3/4" PLASTIC LOCKNUT 36/BX

SIEMENS TI S7 MODULE FANOUT CONNECTOR 6ES72902CA000XA0

Siemens,3RV19152C,(5) Line Side Feeders 4ACC, Bus Bar

SIEMENS, RHVF79H, BREAKER VL NFPA79 HANDLE DG/FG

Siemens,3RT1900-1SB20,SIRIUS ID TAG TOUQ 20X7 (1 SHEET = 20 TAGS), 3RT19001SB20

SIEMENS, 6SL3163-8LD00-0AA0, SINAMICS S120 TERM. KIT BLM 100MM 6SL31638LD000AA0

YOKOGAWA, 250-321-RXRX, PANEL METER MOUNT 0-800AMP 50MV

SQUARE D, 9080-GH10, TERMINAL BLOCK END CLAMP G 46/PKG

MODUTEC, 2S-DAA-300VDC, DC VOLTS METER 0-300

MODUTEC, 2S-DVV-10U10,  ANALOG PANEL METER RANGE & SCALE 10-0-10 VDC.

SIEMENS, 52PA4GN, PILOT LIGHT, NO LENS, XFMR, INC, 120V 

1579060000, Cross-connector, For the terminals, No. of poles: 24 JUPER 14/PKG

SIEMENS, 6FX2003-7CX00, FLANGE FOR POWER PLUG, SZ1.5 

SIEMENS, 52AEB47, ACCESSORY, 6 CLUSTER LED,YELLOW,6V LAMP

E5S600, REPLACED BY FWH-600A, FUSE W/O INDICATOR 600AMP 500VAC/DC HIGH SPEED

SIEMENS, 477 529.7001.00, CABLE WITH ACCESSORIES

SIEMENS, 5SJ4102-7HG41, CIRCUIT BREAKER 2AMP 1POLE C-TRIP TYPE HSJ

 8WH9-020-6CL10 BRIDGE, 10-POLE, FOR TERM WIDTH 6.2 MM

3RK1903-0CD00, DISTANCE MODULE FOR ET 200S STARTER

SIEMENS FURNAS 52PX8B2 - PUSHBUTTON, MOMENTARY, RED, EXTENDED

5SX2 310-8 CIRCUIT BREAKER 10AMP 3POLE 400VAC CURVE-D

3RU1946-3AA01 -OVERLOAD S3 SEPARATE MOUNT KIT

Siemens, 52PA4D9,  Amber Pilot Light, 24V, Full V, NIB

3SB2202-2AB01, SEL SWITCH,MAINT,BLK,COMPLETE,2POS 3SB22022AB01

SCE, SCE-8N806LP, GENERAL PURPOSE ENCLOSURES TYPE 1

LEVITON, L9502, Closed Mesh, Single Weave, Sup Wire Mesh Grip .620 - .740 

ABB, 011548502, MA2,5/5.1 TERMINAL 50/BX

SIEMENS, 52AEB27, ACCESSORY, 6 CLUSTER LED,YELLOW,6V LAMP

SIEMENS, 52PL4DN, PILOT LOIGHT FULL VOLTAGE TYPE 24-28 VOLTS, NO LENS

SIEMENS, 6SE7090-0XX84-2FA0, PANEL OPERATOR PARAMETER AY PMU KEYPAD