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性。并且UPS还具有较强的干扰隔离性能，是一种PLC控制系统的理想电源。
4.2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。
4.3硬件滤波及软件抗如果措施
信号在接入计算机前，在信号线与地间并接电容，以减少共模干扰；在信号两极间加装滤波器可减少差模干扰。
由于电磁干扰的复杂性，要根本消除迎接干扰影响是不可能的，因此在PLC控制系统的软件设计和组态时，还应在软件方面进行抗干扰处理，进一步提高系统的可靠性。常用的一些措施：数字滤波和工频整形采样，可有效消除周期性干扰；定时校正参考点电位，并采用动态零点，可有效防止电位漂移；采用信息冗余技术，设计相应的软件标志位；采用间接跳转，设置软件陷阱等提高软件结构可靠性。
Westinghouse Solid State Starter Soft ES360 360 Amp ES
C-H CH Westinghouse HND3800T107W Optim 800 Amp 800A A
Eaton Cutler Hammer SVX040A2-4A1N1 40 HP VS Drive NIB
Omron IDM Controls P5+ Series CIMR-P5U4055 VT5 100 HP
GE AKR-6D-30H 800 A Amp Air Breaker Versa Trip LSG 635V
GE AKR-6D-30H 800 A Amp Air Breaker Versa Trip LSG 635V
Siemens Sensitrip III Breaker SCLD69600 600A A 600 Amp
Allen Bradley AB 1336F-BX040-AA-EN 40 HP VS Drive REMAN
Reliance Electric 2GU41100 100HP GP2000 VS Drive 100 HP
Cutler Hammer Breaker ND312T32W 1200 Amp A 1200A 600A
Westinghouse SPCB 2000 Amp SPCB2000 1800A Trip LI
I-T-E XL-X Circuit Breaker 800 Amp 800A A Bus Plug 3P3W
ABB Type K800 S K800S 800 Amp 800A Air Breaker LI
Eaton Cutler Hammer SVX040A2-4A1N1 40 HP VS Drive NIB
Square D NHL361200 NHL 1200 Amp A 1200A High Interrupt
Telemecanique LC1-FX43 Vacuum Contactor 1600A LC1FX43
Eaton Cutler Hammer 600 Amp Bus Fusible Switch P3F366R
Zenith 800 A Amp ZTS81EC-31 Transfer Switch 208 V 3 PH
Square D Altistart 46 ATS46C59N Soft Start 400 HP ATS46
Westinghouse DS-632 DS632 3200 Amp Amptector I – A LSG
Telemecanique Altivar 66 ATV66D79N4 AC Drive 75HP/100HP
Eaton Cutler Hammer SVX040A2-4A1N1 40 HP VS Drive NNB
GE High IC TKL12S 1200 Amp 1200A A RMS9 TS20LSIGT2 1000
GE High IC TKL12S 1200 Amp 1200A A RMS-9 TS20LSIGT2 800
Monitek / Sentex Turbidimeter TT6 210 211 sensor NIB
Siemens Sentron SCMD69800ANGT SCMD69800 Amp 800A A M/N
Square D Schneider Masterpact NW16H1 1600 Amp 800A LSIG
Toshiba E3 VT130E3U410K 100HP Inverter VS Drive 100 HP
Siemens Sikostart 3RW34 softstart starter 352A 150 HP
Benshaw RSi-075-H-4-L 100 HP Variable Speed Drive 125A
Indramat MDD112D-N-030-N2M-130PB2 Magnet Servo Motor
GE Power Break PowerBreak TPS203F 2000 Amp 2000A A
Siemens K-1600 K1600 1600Amp Static Trip III draw-out
GE General Electric SK SKPB36BC1200 1200 A 1200Amp
Square D I Line ME ME36600LIG ME36600 800 Amp Frame
Siemens SBS 1600 SBS 1600 SBS2016F 1200 A Amp SB16TLSIG
Fanuc A06B-0147-B177 AC Servo Motor A22/2000 3.8 kW 3PH
Square D I-Line NC361200 NC-361200 NA 1200 Amp 1200A A
GE General Electric THK4VF46 1200 Amp 1200A A T4VT Trip
Westinghouse 50 DH-P 250 DHP 50DH-P 1200 Amp A Breaker
Westinghouse 50 DH-P 250 DHP 50DH-P 1200 A Air Breaker
Westinghouse PCF 2000 Amp 2000A A PCF32000F 1600A Trip
Westinghouse SPCB 2000 Amp SPCB2000 1000A Trip LSG
GE General Electric 1200 Amp 1200A A THKS4612G breaker
GE AKR-6D-50 1600 A Amp Air Breaker MVT Trip LSIG 635 V
Hitran Transformer 180 kVA 575/460Y/266 V 180kVA 460 Y
Westinghouse DS-632 DS632 3200 Amp Satin etc. 21 LS
GE AKR-6D-50 1600 A Amp Air Breaker MVT Trip LI 635 V
Square D I-Line Main Breaker Panelboard 1200Amp 600 Vac
Square D PowerPact I Line PJA36080 CU44A 800Amp 800 A
Square D I-Line LX LXI36500 I-Limiter 500 Amp 500A A
Klockner-Moeller NZM12-800 with Trip ZM12a-70-NA Amp
