1设备选型
在选择设备时，首先要选择有较高抗干扰能力的产品，其包括了电磁兼容（EMC），尤其是抗外部干扰能力，如采用浮地技术、隔离能好的PLC系统；其次还应了解生产厂给出的抗干扰指标，如共模拟制比、差模拟制比，耐压能力、允许在多大电场强度和多高频率的磁场强度环境中工作；另外是靠考查其在类似工作中的应用实绩。在选择国外进口产品要注意：我国是采用220V高内阻电网制式，而欧美地区是110V低内阻电网。由于我国电网内阻大，零点电位漂移大，地电位变化大，工业企业现场的电磁干扰至少要比欧美地区高4倍以上，对系统抗干扰能要求更高，在国外能正常工作的PLC产品在国内工业就不一定能可靠运行，这就要在采用国外产品时，按我国的标准（GB/T13926）合理选择。
2综合抗干扰设计
主要考虑来自系统外部的几种如果抑制措施。主要内容包括：对PLC系统及外引线进行屏蔽以防空间辐射电磁干扰；对外引线进行隔离、滤波，特别是原理动力电缆，分层布置，以防通过外引线引入传导电磁干扰；正确设计接地点和接地装置，完善接地系统。另外还必须利用软件手段，进一步提高系统的安全可靠。
四、主要抗干扰措施
1采用能优良的电源，抑制电网引入的干扰
在PLC控制系统中，电源占有极重要的地位。电网干扰串入PLC控制系统主要通过PLC系统的供电电源（如电源、I/O电源等）、变送器供电电源和与PLC系统具有直接电气连接的仪表供电电源等耦合进入的。现在，对于PLC系统供电的电源，一般都采用隔离能较好电源，而对于变送器供电的电源和PLC系统有直接电气连接的仪表的供电电源，并没受到足够的重视，虽然采取了一定的隔离措施，但普遍还不够，主要是使用的隔离变压器分布参数大，抑制干扰能力差，经电源耦合而串入共模干扰、差模干扰。所以，对于变送器和共用信号仪表供电应选择分布电容小、抑制带大（如采用多次隔离和屏蔽及漏感技术）的配电器，以减少PLC系统的干扰。
位保证电网馈点不中断，可采用在线式不间断供电电源（UPS）供电，提高供电的安全可靠。并且UPS还具有较强的干扰隔离能，是一种PLC控制系统的理想电源。
2电缆选择的敖设
为了减少动力电缆辐射电磁干扰，尤其是变频装置馈电电缆。笔者在某工程中，采用了铜带铠装屏蔽电力电缆，从而降低了动力线生产的电磁干扰，该工程投产后取得了满意的效果。
不同类型的信号分别由不同电缆传输，信号电缆应按传输信号种类分层敖设，严禁用同一电缆的不同导线同时传送动力电源和信号，避免信号线与动力电缆靠近平行敖设，以减少电磁干扰。
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MVME
1 AVME 932X 1
2 AVME 947X 3
3 IM-VME-ADEPT R-B1 L1 1
10332-10250
410332-12400 2
5 6008-LTV 1
6 6008-SV 1
7 4D-485 1
8 68030X 2
9 112Y-281134 1
10 112Y-281140 2
11 115B 1
12 146 1
13 191-24-22156 1
14 PCB-5510-0 2
15 SC-2XL 5
16 CPCI-910 2
17 CPU-5V/64-110-2/C13 1
18 SYS68K ASCU-2 1
19 SYS68KCPU29X 1
20 SYS68KPIO-1 1
21 SYS68KWFC-1 3
22 3230 2
23 VMIUME 7648-540 10
24 GESVIG-4VME 1
25 KVME-041 3
26 HK 68/V2FA 1
27 E1406A 1
28 MVS 100 MC541 1
29 IV-3204A-4MB 2
30 IV-3273 1
31 IV-3273A 1
32 VTR-1 3
33 EE4014 1
34 NX02 4
35 NX03S 19
36 AT-GPIB/TNT 5
37 GPIB 1014 4
38 VME MXI 2
39 NT6D51AA 2
40 3G8B3-MA011 2
41 3G8B3-NO000 2
42 VME44 4
43 VMEX-4E 1
44 PT-VME 940U 4
45 CPU40D-213E 1
46 EPC-16 3
47 VCOM-8 4
48 VIPC610 1
49 VIPC616 4
50 MPS 022 4
51 VME 1553 2
52 VME 553 1
53 6FM1661-3AA00 5
54 5136-SD-VME 2
55 V400 V440K9 2
