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    CPU速度和內存容量是PLC的重要參數，它們決定著PLC的工作速度，IO數量及軟件容量等，因此限制著控制規模。　　

四、I/O模塊

    PLC與電氣回路的接口，是通過輸入輸出部分（I/O）完成的。I/O模塊集成了PLC的I/O電路，其輸入暫存器反映輸入信號狀態，輸出點反映輸出鎖存器狀態。輸入模塊將電信號變換成數字信號進入PLC系統，輸出模塊相反。I/O分為開關量輸入（DI），開關量輸出（DO），模擬量輸入（AI），模擬量輸出（AO）等模塊。

    開關量是指只有開和關（或1和0）兩種狀態的信號，模擬量是指連續變化的量。常用的I/O分類如下：

    開關量：按電壓水平分，有220VAC、110VAC、24VDC，按隔離方式分，有繼電器隔離和晶體管隔離。

    模擬量：按信號類型分，有電流型（4-20mA,0-20mA）、電壓型（0-10V,0-5V,-10-10V）等，按精度分，有12bit,14bit,16bit等。

    除了上述通用IO外，還有特殊IO模塊，如熱電阻、熱電偶、脈沖等模塊。

    按I/O點數確定模塊規格及數量，I/O模塊可多可少，但其*大數受CPU所能管理的基本配置的能力，即受*大的底板或機架槽數限制。　　

五、電源模塊

    PLC電源用于為PLC各模塊的集成電路提供工作電源。同時，有的還為輸入電路提供24V的工作電源。電源輸入類型有：交流電源（220VAC或110VAC），直流電源（常用的為24VDC）。　　

六、底板或機架

    大多數模塊式PLC使用底板或機架，其作用是：電氣上，實現各模塊間的聯系，使CPU能訪問底板上的所有模塊，機械上，實現各模塊間的連接，使各模塊構成一個整體。　　

七、PLC系統的其它設備

1、編程設備：編程器是PLC開發應用、監測運行、檢查維護不可缺少的器件，用于編程、對系統作一些設定、監控PLC及PLC所控制的系統的工作狀況，但它不直接參與現場控制運行。小編程器PLC一般有手持型編程器，目前一般由計算機（運行編程軟件）充當編程器。

2、人機界面：*簡單的人機界面是指示燈和按鈕，目前液晶屏（或觸摸屏）式的一體式操作員終端應用越來越廣泛，由計算機（運行組態軟件）充當人機界面非常普及。

3、輸入輸出設備：用于性地存儲用戶數據，如EPROM、EEPROM寫入器、條碼閱讀器，輸入模擬量的電位器，打印機等。　　　

八、PLC的通信聯網

    依靠先進的工業網絡技術可以迅速有效地收集、傳送生產和管理數據。因此，網絡在自動化系統集成工程中的重要性越來越顯著，甚至有人提出"網絡就是控制器"的觀點說法。
BROWNING 1-7/16" SHAFT DIA. 2-BOLT FLANGE MOUNT BEARING, VF2S-123M *NEW*

FAFNIR 35MM I.D. 72MM O.D. DOUBLE ROW BALL BEARING, 5207W *NEW*

INA NA4905 NEEDLE BEARING

BROWNING 1-3/8, 5/16 SPLIT TAPER BUSHING P1 1 3/8 5/16 *NEW*

WHITTET-HIGGINS CO LOCK NUT BH-05 80399 LOT OF 2 NIB

CHICAGO RAWHIDE * OIL SEAL NIB * 5832

CHICAGO RAWHIDE * OIL SEAL NIB * 6213

MARTIN BORE SIZE 1-3/6" SPROCKET 40BS15 1 3/16 *NEW*

FAG BEARING 33212 SEALED

TIMKEN  ROLLER BEARING 55187 NIB

FAFNIR 1-1/4"I.D, 2-1/8"O.D, BEARING 2MM9106WI DUL NNB

FAG THRUST BALL BEARING 52306

THOMSON 3.046" ID FLANGE 8122-448-002 / R-2202 *NEW*

SNR 1.3"ID, 3.2"OD BALL BEARING G1DUJ74 *NEW*

TIMKEN CONE TAPERED ROLLER BEARING 659 NIB

PEER BEARING W166285 FHR210-31

KOYO BEARINGS NJ220RC3FY

GARLOCL KLOZURE OIL SEAL 53X2543

MCGILL CAM FOLLOWER CF 7/8 SB NIB

DODGE TAPER-LOCK BUSHING 1610 X 7/8 KW 117082 NIB

SKF BALL BEARING 7305 BEGBY NIB

THK 30" OAL TWO SQUARE BLOCK BALL SPINE LBH30 *NEW*

ZMZ CONVEYOR BEARING 3079ZZIO

SKF 3-3/4"OD 2"ID THRUST BALL BEARING 51310 *NEW*

HUB CITY 3/16", MOUNTED BEARING B220X1 *NEW*

TIMKEN ROLLER BALL BREARINGS 43132 *NEW, 1 SET OF 2*

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BROWNING 2" BEARING UNIT VTWS-232 NEW IN BOX

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TIMKEN ROLLER BEARING CUP 25520 NIB

FAFNIR ROLLER BEARING  G1203KRRB

NORD GEAR MOTOR 80L4BRE20HL

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MARTIN 1-5/8" BORE BUSHING SDS 1 5/8 NIB

OSBORN 2-1/4" BORE BEARING 96165 *NEW*

SEALMASTER 2 3/16 F-530 BEARING, NIB

GATES 2517 x 1-7/8 BUSHING 2517 *NEW*

LAMINA SHORT SHOULDER BUSHING SC-150-SB *NEW*

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INA DOUBLE ROW BALL BEARING LR5204NPPU NIB

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MCGILL * CAM FOLLOWER NIB * CF 1 S / 76143

YALE 35MM I.D. 59MM O.D. BEARING, 065001000 *NEW*

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MCGILL INNER RACE BEARING MI-12 LOT OF 6 NIB

RCD OIL PUMP AND BEARING HEAD ASSEMBLY *NEW*

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INA 56MM BORE BALL BEARING, 51111J *NEW*

McGILL CF-2-1/2-SR CAM FOLLOWER BEARING, NIB

THOMPSON BALL BUSHING 406080 NIB

TIMKEN 2.241" OD, 2.117" ID, 0.630" W, WEAR SLEEVE J1111 *NEW*

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INA 56MM BORE BALL BEARING, 51111J *NEW*

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IKO CAM FOLLOWER CF18VBUUR *NEW*

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