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2.3 接地
良好的接地是保證PLC可*工作的重要條件，可以避免偶然發生的電壓衝擊危害。接地線與機器的接地端相接，基本單元接地。如果要用擴展單元，其接地點應與基本單元的接地點接在一起。為了抑制加在電源及輸入端、輸出端的幹擾，應給可編程控制器接上地線，接地點應與動力設備（如電機）的接地點分開。若達不到這種要求，也做到與其他設備公共接地，禁止與其他設備串聯接地。接地點應盡可能*近PLC。
2.4 直流24V接線端
使用無源觸點的輸入器件時，PLC內部24V電源通過輸入器件向輸入端提供每點7mA的電流。
PLC上的24V接線端子，還可以向外部傳感器（如接近開關或光電開關）提供電流。24V端子作傳感器電源時，COM端子是直流24V地端。如果採用擴展船員，則應將基本單元和擴展單元的24V端連接起來。另外，任何外部電源不能接到這個端子。
如果發生過載現象，電壓將自動跌落，該點輸入對可編程控制器不起作用。
Eagle 5300-1000 SHIPSAMEDAY 1557M
Koganei ZC153B. L150185, Ship Same Day With 2-3 Days Shipping 1553F
Dodge Reliance Flange Mount Bearing F2B-8C-010, RACK D BOTOM D21
Efector 200, 0G5046, 0GP-FPKG/US-100, Shipsameday, BOX A 129A2
Festo MSSD-C-24-LED-M12-SA , 13002021, SHIPSAMEDAY 1628A30
MDC 410103 SS, BlankOff, .25S-25 , Shipsameday 115A7
Lumberg Cable RST 3-RKWT 4-3-610/2M RST 3-RKWT 4-3-S797/2M 1558G
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Allen Bradley Selector Switch Green light 2 Pos, 800E-A2L, 1604P8
Fairchild BAW56, Power, Switching 85V 200mA A1, SHIPSAMEDAY N18
Swagelok Excess Flow Valve, 1/4 Tube gal/min (3.8 L) Spring, SS-XSS4-1 1610A6
Allen-Bradley 1492-CB2-G060 ShipSameDay 1654A12
Keyence PHOTOELECTRIC SENSOR PZ2-51T, PZ251T, Shipsameday 1629A1
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Allen Bradley 871C-A5N18-N3 Proximity Sensor 871CA5N18N3 1647D
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