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（二）開(kāi)關(guān)量I/O

    開(kāi)關(guān)量I/O接口可從傳感器和開(kāi)關(guān)（如按鈕、限位開(kāi)關(guān)等）及控制設(shè)備（如指示燈、報(bào)警器、電動(dòng)機(jī)起動(dòng)器等）接收信號(hào)。典型的交流輸入/輸出信號(hào)為24～240V，直流輸入/輸出信號(hào)為5～240V。盡管輸入電路因制造廠家不同而不同，但有些特性是相同的，如用于消除錯(cuò)誤信號(hào)的抖動(dòng)電路等。此外，大多數(shù)輸入電路在高壓電源輸入和接口電路的控制邏輯部分之間都設(shè)有可選的隔離電路。在評(píng)估離散輸出時(shí)，應(yīng)考慮熔絲、瞬時(shí)浪涌保護(hù)和電源與邏輯電路間的隔離電路。熔絲電路也許在開(kāi)始時(shí)花費(fèi)較多，但可能比在外部安裝熔絲耗資要少。

    （三）模擬量I/O

    模擬量輸入/輸出接口一般用來(lái)感知傳感器產(chǎn)生的信號(hào)。這些接口可用于測(cè)量流量、溫度和壓力，并可用于控制電壓或電流輸出設(shè)備。這些接口的典型量程為-10～+10V、0～+11V、4～20mA或10～50mA。一些制造廠家在PLC上設(shè)計(jì)有特殊模擬接口，因而可接收低電平信號(hào)，如RTD、熱電偶等。一般來(lái)說(shuō)，這類接口模塊可用于接收同一模塊上不同類型的熱電偶或RTD混合信號(hào)。

DURA 1"X1.5MM 6 THREADS HS TAP D6
 
HAND TAP L6" D2 9/16" HS 6 THREAD
 
MECMAN PRESSURE REGULATOR 370-12 0400-1
 
GE SURGE REDUCER CR127X4 NIB
 
1-1/4"X1" HSS USA MILL L:6.801 99924
 
PIPE TAP HS 8 FLUTE 10" LENGTH
 
KENNAMETAL CLAMP CKM 19 NIB, LOT OF 5
 
R&T CO. 10-FLUTE 1 11" KEYSTONE REAMER
 
BINKS AIR NOZZLE 46-6020 *NEW,SEALED*
 
SJ-DC DRILL CHUCK 09459 3/16 DR
 
CLECO W/APEX QR-A-08-1/4'' HEX DRIVE PNEUMATIC PISTOL GRIP SCREWDRIVER
 
RENISHAW LT02A OMP TOOL SETTING KIT A-2030-0121-02 *NIB*
 
IC'S 14-PIN P8736/DM7408N LOT OF 18
 
STEEL CITY PARALLEL 1" CONDUIT CLAMP LOT OF 10
 
BRADY 1.125" X 90' WHITE ON BLUE LABEL CARTRIDGE 2-8239-00
 
INGERSOLL-RAND LOAD TROLLEY30565 LOT OF 2 SEALED
 
ASHCROFT 3-1/2" TYPE-1009 0-15PSI 0-30-IN/HG.VAC GAUGE 35-1009-SWL-02L NIB
 
EG&F WAKEFIELD HEAT EXCHANGER 721
 
MORSE 2-FLUTE 1-15/32 15-1/2" HS TWIST DRILL SHANK
 
SIPHON PUMP HAND OPERATED FOR KEROSENE-GAS-WA?TER-DIESEL SEALED
 
O-Z GEDNEY 3/4" 90° LIQUIDTIGHT CONNECTOR 4Q-975 9 IN BOX, NIB
 
CR INDUSTRIES OIL SEAL 8624 LOT OF 4 NIB
 
BUGELSCHELLE 16-22MM LOT OF 5 SETS OF CLAMPS NIB
 
ALCO CONTROLS LIQUID LINE FILTER-DRIER EK 05 2
 
STARRETT 13"-14" OUTSIDE MICROMETER IN CASE 436
 
NAPA GOLD OIL FILTER 1342 LOT OF 2 NIB
 
NACHI JAPAN HSS CARBIDE END MILL 9/10 X 4
 
INGERSOLL-RAND PISTOL GRIP PNEUMATIC NUTRUNNER 1/2 INCH DRIVE SQUARE
 
COR-MET 1/16" 25LBS WELDING WIRE 13613 FC NIB
 
STARRETT 11"-12" MICROMETER CALIPER IN CASE NO. 436
 
REGAL BELOIT 5/16-24 NF HSCH 3 830E
 
CLEVELAND TWIST-DRILL TAPER STRAIGHT FLUTE W/ SQUARE SHANK EDP-24260 NO.5 NIB
 
MCGILL HIGH INTENSITY BULB CHANGER
 
SUHNER MONO MASTER AUTOMATIC DRILL BEM 12/16-8, PARTS/REPAIR #3
 
VALENITE MODCO TOOLS M1017459 2/M/02
 
MASTERLOCK COMMERCIAL PADLOCK LOT OF 3, NIB
 
INGERSOLL RAND 3/8" RIGHT ANGLE PNEUMATIC NUTRUNNER NO PART NUMBER
 
NUMATICS REGULATOR R21R-Q4EGLP

Atlas NO. 53 Streamline Silver Surface MOUNT DOOR CLOSER
 
3" GALVANIZED O CLAMP LOT OF 2
 
LENOX BAND SAW BLADE 0908056 LOT OF 3
 
NORTON 12"x3/4"x5" 3025 RPM GRINDING WHEEL 23A701-L5B NNB
 
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3-VANE PUMP IMPELLER 281063 / T324
 
SMW AUTOBLOCK 100 SIN-S, 33093110 CLOSED CENTER
 
COLSON PERFORMA 6X2 FLAT TREAD WHEEL W/MOUNT
 
WELDON 1" HS END MILL A52-6 C70-N6
 
LEADER GASKET INC. 10.88X11.88X.17?5 GASKET S316L/LF / 11L6 LOT OF 10, NNB
 
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PEACOCK .001"-1.000" DIAL INDICATOR 1330
 
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KOMET COOLANT COLLET A33530100400 *NEW
 
701013 GTD HS M19.9 x 1.25 D1
 
MORSE 2-FLUTE 11/16 9-1/2" HS TWIST DRILL SHANK
 
FESTO 18790 END PLATE IEPR-04-D-1 NIB
 
GREENFIELD M18 x 2.0 HS GO-7
 
TECH-MOTIVE 3/8" DRIVE ELECTRONIC NUTRUNNER TOOL T066I030MSP3 W/ CABLE 26390-B
 
STANLEY F30L74TA-15 5/8" CROWSFOOT OPEN END PNEUMATIC RATCHET
 
FIRELOCK * IRON CAP * 3/88.9
 
FIBOX 15X7.5X7" CONTROL PANEL ENCLOSURE NNB UL PC 3819 18 G
 
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KOMET INSERT BORING TOOL A3136251 *NEW*
 
TOHNICHI TORQUE WRENCH 900QL3LS NIB
 
DOUBLE ENDED SIDE MILL LEAD: 3.401 5/8 X 5/8 HSS
 
ACME 4 1-15/16" C4 TAP C4 NT