接地是提高电子设备电磁兼容性（EMC）的有效手段之一。正确的接地，既能抑制电磁干扰的影响，又能抑制设备向外发出干扰；而错误的接地，反而会引入严重的干扰信号，使PLC系统将无法正常工作。
PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。
此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流就可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。
ASHCROFT 20W1005 H 01B VAC 30-0IN-HG 2 IN 1/8 IN NPT PRESSURE GAUGE D554853
ASHCROFT 35-1009-AW-02L-?600 DURALIFE 0-600PSI 1/4 IN NPT GAUGE D554845
FOXBORO SUPPLY PRESSURE GAUGE DO NOT EXCEED 200KPA/30PSI 1/4IN NPT D541248
FOXBORO 0-30PSI 1/8 IN NPT SUPPLY PRESSURE GAUGE D541250
USG 656615AN3CD3A00 AMETEK PRESSURE GAUGE 0-600PSI 1/4IN NPT D585422
ASHCROFT 20W1005 H 02L 0-100PSI 2 IN 1/4 IN NPT PRESSURE GAUGE D559422
MARSH J1846 BELLOFRAM 0-60PSI 2 IN 1/8 IN NPT PRESSURE GAUGE D559423
ASHCROFT 20W1005 H 01B 0-100PSI 2 IN 1/8 IN NPT PRESSURE GAUGE D559419
WEKSLER BM2-39 -40-0-160F -40-0-70C THERMOMETER 1/2 IN NPT 6IN STEM D545328
TREND CR5009-X-A BI-METAL THERMOMETER 150-750F D568820
WINTERS 0-3000PSI 4 IN 3/4 IN NPT PRESSURE GAUGE D568748
ASHCROFT 30-EI-60-R-060-?0/250F THERMOMETER 0-250F 3 IN 1/2 IN NPT D555300
USG 56-81-5 0-200PSI 4 IN 1/2 IN NPT PRESSURE GAUGE D569507
SPRIANO 10/2000 5-1/2IN STEM THERMOMETER 0-60C 1/2 IN NPT D537230
DIXON GL340 PRESSURE GAUGE 0-200PSI 2-1/2 IN 1/4 IN NPT D581693
ASHCROFT 25W1005 H 02L PRESSURE GAUGE 0-30IN-HG 2-1/2 IN 1/4 IN NPT D581700
WIKA 9678000 NPT 2-1/2IN 1/4IN PRESSURE GAUGE D581689
AMETEK USG 505A PRESSURE GAUGE 2-1/2IN 1/4IN NPT D581695
WORKSMART WS-PE-GAGE-44 PRESSURE GAUGE 2-1/2IN 1/4IN NPT D581573
ASHCROFT 15W1001TH 01B XUC160 0-160PSI 1-1/2IN 1/8IN NPT PRESSURE GAUGE D588744
ASHCROFT 20W1005-H-02L-1?00 1/4"NPT 0-100PSI 2IN PRESSURE GAUGE D588322
AMETEK 163930 P500K 0-30PSI 2IN 1/8"NPT PRESSURE GAUGE D588326
AMETEK 005495A USG C505A -30-0IN-HG 0-30PSI 1/4IN NPT PRESSURE GAUGE D546398
ASHCROFT 30-0IN-HG 0-30PSI 1/4 IN NPT PRESSURE GAUGE D537717
ASHCROFT 30-0IN-HG 0-15PSI 1/2IN NPT PRESSURE GAUGE D537719
GORMAN RUPP 21-1348-02 LIQUID FILLED PRESSURE GAUGE 0-160PSI 1/4IN NPT D582067
FISHER 0-160PSI 1/4 IN NPT PRESSURE GAUGE D542042
TRERICE 800B1501BA100 0-60PSI 1-1/2 IN 1/8 IN NPT PRESSURE GAUGE D542034
TRERICE 800B D39112 0-60PSI 1-1/2 IN 1/8 IN NPT PRESSURE GAUGE D542037
ASHCROFT 35-1009-AW-02L-?600-XLJLL DURALIFE 0-600PSI 3-1/2 IN GAUGE D542127
ASHCROFT DURALIFE PRESSURE GAUGE 0-60PSI 1/4 IN NPT D578579
ASHCROFT 25W1005 H 02B DRESSER 0-60PSI 2-1/2 IN 1/4 IN PRESSURE GAUGE D545528
WINTERS PFQ904 PRESSURE GAUGE 0-100PSI 2-1/2IN 1/4IN NPT D592998
MOORE 3-1/2IN 1/4IN NPT 0-14PSI PRESSURE GAUGE D593009
ASHCROFT 20W1005-H-02L-2?00 PRESSURE GAUGE 0-200PSI 2IN 1/4IN NPT D585686
MARSH J4676 0-2000PSI 2-1/2 IN 1/4 IN NPT PRESSURE GAUGE D537534
NISSHIN R407C PRESSURE GAUGE 0-4MPA JIC-4 D578721
NISSHIN R407C COMPOUND PRESSURE GAUGE -0.1-0-1.6MPA JIC-4 D578722
ASHCROFT 35-1009-AW-02B-?3-15 GAUGE 3-15PSI 0-** 3-1/2IN 1/4IN NPT D585675
ASHCROFT TYPE 1008 0-1000PSI 4 IN 1/4 IN NPT PRESSURE GAUGE D537579
WEKSLER BY12YPS4CW PRESSURE GAUGE 0-2000PSI 2-1/2IN 1/4IN NPT D585682
ASHCROFT 20W1005-H-02B-1?00 PRESSURE GAUGE 0-100PSI 2IN 1/4IN NPT D585691
ASHCROFT 20W1005-H-02L-1?60 PRESSURE GAUGE 0-160PSI 2IN 1/4IN NPT D585766
ASHCROFT 20W1005-H-02L-3?0 PRESSURE GAUGE 0-30PSI 2IN 1/4IN NPT D585769
AMETEK USG 163272 P500K PRESSURE GAUGE 0-60PSI 2IN 1/4IN NPT D585772
AMETEK P844U 0-100PSI PRESSURE GAUGE 2-1/2 IN 1/8 IN NPT D578710
ASHCROFT TYPE 1008 0-160PSI 100MM 1/4 IN NPT PRESSURE GAUGE D578688
MEYLAN 20-200FPM 5/8 IN NPT GAUGE D546438
WIKA 8945217 432.12.100 SEALGAUGE 0-250PSI 3/4 IN NPT PRESSURE GAUGE D559450
ASHCROFT 20W1005 H 01B VAC 30-0IN-HG 2 IN 1/8 IN NPT PRESSURE GAUGE D554853
ASHCROFT 35-1009-AW-02L-?600 DURALIFE 0-600PSI 1/4 IN NPT GAUGE D554845
FOXBORO SUPPLY PRESSURE GAUGE DO NOT EXCEED 200KPA/30PSI 1/4IN NPT D541248
FOXBORO 0-30PSI 1/8 IN NPT SUPPLY PRESSURE GAUGE D541250
USG 656615AN3CD3A00 AMETEK PRESSURE GAUGE 0-600PSI 1/4IN NPT D585422
ASHCROFT 20W1005 H 02L 0-100PSI 2 IN 1/4 IN NPT PRESSURE GAUGE D559422
MARSH J1846 BELLOFRAM 0-60PSI 2 IN 1/8 IN NPT PRESSURE GAUGE D559423
ASHCROFT 20W1005 H 01B 0-100PSI 2 IN 1/8 IN NPT PRESSURE GAUGE D559419
WEKSLER BM2-39 -40-0-160F -40-0-70C THERMOMETER 1/2 IN NPT 6IN STEM D545328
TREND CR5009-X-A BI-METAL THERMOMETER 150-750F D568820
WINTERS 0-3000PSI 4 IN 3/4 IN NPT PRESSURE GAUGE D568748
ASHCROFT 30-EI-60-R-060-?0/250F THERMOMETER 0-250F 3 IN 1/2 IN NPT D555300
USG 56-81-5 0-200PSI 4 IN 1/2 IN NPT PRESSURE GAUGE D569507
SPRIANO 10/2000 5-1/2IN STEM THERMOMETER 0-60C 1/2 IN NPT D537230
DIXON GL340 PRESSURE GAUGE 0-200PSI 2-1/2 IN 1/4 IN NPT D581693
ASHCROFT 25W1005 H 02L PRESSURE GAUGE 0-30IN-HG 2-1/2 IN 1/4 IN NPT D581700
WIKA 9678000 NPT 2-1/2IN 1/4IN PRESSURE GAUGE D581689
AMETEK USG 505A PRESSURE GAUGE 2-1/2IN 1/4IN NPT D581695
WORKSMART WS-PE-GAGE-44 PRESSURE GAUGE 2-1/2IN 1/4IN NPT D581573
ASHCROFT 15W1001TH 01B XUC160 0-160PSI 1-1/2IN 1/8IN NPT PRESSURE GAUGE D588744
ASHCROFT 20W1005-H-02L-1?00 1/4"NPT 0-100PSI 2IN PRESSURE GAUGE D588322
AMETEK 163930 P500K 0-30PSI 2IN 1/8"NPT PRESSURE GAUGE D588326
AMETEK 005495A USG C505A -30-0IN-HG 0-30PSI 1/4IN NPT PRESSURE GAUGE D546398
ASHCROFT 30-0IN-HG 0-30PSI 1/4 IN NPT PRESSURE GAUGE D537717
ASHCROFT 30-0IN-HG 0-15PSI 1/2IN NPT PRESSURE GAUGE D537719
GORMAN RUPP 21-1348-02 LIQUID FILLED PRESSURE GAUGE 0-160PSI 1/4IN NPT D582067
FISHER 0-160PSI 1/4 IN NPT PRESSURE GAUGE D542042
TRERICE 800B1501BA100 0-60PSI 1-1/2 IN 1/8 IN NPT PRESSURE GAUGE D542034
TRERICE 800B D39112 0-60PSI 1-1/2 IN 1/8 IN NPT PRESSURE GAUGE D542037
ASHCROFT 35-1009-AW-02L-?600-XLJLL DURALIFE 0-600PSI 3-1/2 IN GAUGE D542127
ASHCROFT DURALIFE PRESSURE GAUGE 0-60PSI 1/4 IN NPT D578579
ASHCROFT 25W1005 H 02B DRESSER 0-60PSI 2-1/2 IN 1/4 IN PRESSURE GAUGE D545528
WINTERS PFQ904 PRESSURE GAUGE 0-100PSI 2-1/2IN 1/4IN NPT D592998
MOORE 3-1/2IN 1/4IN NPT 0-14PSI PRESSURE GAUGE D593009
ASHCROFT 20W1005-H-02L-2?00 PRESSURE GAUGE 0-200PSI 2IN 1/4IN NPT D585686
MARSH J4676 0-2000PSI 2-1/2 IN 1/4 IN NPT PRESSURE GAUGE D537534
NISSHIN R407C PRESSURE GAUGE 0-4MPA JIC-4 D578721
NISSHIN R407C COMPOUND PRESSURE GAUGE -0.1-0-1.6MPA JIC-4 D578722
ASHCROFT 35-1009-AW-02B-?3-15 GAUGE 3-15PSI 0-** 3-1/2IN 1/4IN NPT D585675
ASHCROFT TYPE 1008 0-1000PSI 4 IN 1/4 IN NPT PRESSURE GAUGE D537579
WEKSLER BY12YPS4CW PRESSURE GAUGE 0-2000PSI 2-1/2IN 1/4IN NPT D585682
ASHCROFT 20W1005-H-02B-1?00 PRESSURE GAUGE 0-100PSI 2IN 1/4IN NPT D585691
ASHCROFT 20W1005-H-02L-1?60 PRESSURE GAUGE 0-160PSI 2IN 1/4IN NPT D585766
ASHCROFT 20W1005-H-02L-3?0 PRESSURE GAUGE 0-30PSI 2IN 1/4IN NPT D585769
AMETEK USG 163272 P500K PRESSURE GAUGE 0-60PSI 2IN 1/4IN NPT D585772
AMETEK P844U 0-100PSI PRESSURE GAUGE 2-1/2 IN 1/8 IN NPT D578710
ASHCROFT TYPE 1008 0-160PSI 100MM 1/4 IN NPT PRESSURE GAUGE D578688
MEYLAN 20-200FPM 5/8 IN NPT GAUGE D546438
WIKA 8945217 432.12.100 SEALGAUGE 0-250PSI 3/4 IN NPT PRESSURE GAUGE D559450
厦门仲鑫达科技有限公司专注于AB,GE,施耐德等