2.3 来自系统内部的干扰

　　主要由系统内部元器件及电路间的相互电磁辐射产生，如逻辑电路相互辐射及其对模拟电路的影响，模拟地与逻辑地的相互影响及元器件间的相互不匹配使用等。这都属于制造厂对系统内部进行电磁兼容设计的内容，比较复杂，作为应用部门是无法改变，可不必过多考虑，但要选择具有较多应用实绩或经过考验的系统

3 工程实施中主要抗干扰措施

　　为了保证系统在工业电磁环境中免受或减少内外电磁干扰，必须从设计阶段开始便采取三个方面抑制措施：抑制干扰源；切断或衰减电磁干扰的传播途径；提高装置和系统的抗干扰能力。这三点就是抑制电磁干扰的基本原则。

　　控制系统的抗干扰是一个系统工程，要求制造单位设计生产出具有较强抗干扰能力的产品，且有赖于使用部门在工程设计、安装施工和运行维护中予以全面考虑，并结合具有情况进行综合设计，才能保证系统的电磁兼容性和运行可靠性。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；对外引线进行加装隔离器，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性。

　　3.1 采用性能优良的电源，抑制电网引入的干扰

　　在控制系统中，电源占有极重要的地位。电网干扰串入控制系统主要通过PLC系统的供电电源（如CPU 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，一般都采用隔离性能较好电源，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（如：使用北京平和公司隔离配电器），可以减少 PLC 系统的干扰。此外，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。

　　3.2 电缆敷设

　　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。不同类型的信号及控制电缆分别由不同电缆传输，信号电缆应按传输信号种类与动力电缆分层敖设，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。另外对于信号电缆及控制电缆应采用屏蔽电缆   

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MAX232CWE-T MAXIM

MAX6667AUT-T MAXIM

43160-2103 MOLEX

STF10NK50Z ST MICROELECTRONICS SEMI

74ABT646AD PHILIPS

PCK2057DGG PHILIPS

440297-1 AMP

282828-2 AMP

X9316WSI-3 XICOR

FIN324CGFX FAIRCHILD

CD74AC04M96 HARRIS

SI3456DV-T1 VISHAY

MAX942CUA-T MAXIM

MMSD103T1 ON SEMICONDUCTOR

AD8197AASTZ-RL ANALOG DEVICES

EL1528CLZ ELANTEC

MT58LC32K32C5-10:G MICRON TECHNOLOGY,INC

878325322 MOLEX

LQH43NN222K01L MURATA

NE555D FAIRCHILD

RMC18-5111FT KAMAYA ELECTRIC CO. LTD

MC68HC908GP52CFB FREESCALE SEMICONDUCTOR

750101R560 CTS

LAT676-Q OSRAM OPTO

CRCW08058K25FKEA VISHAY

MC68HC001FN8 FREESCALE SEMICONDUCTOR

LTC1063CS LINEAR TECHNOLOGY

T405-700B-TR ST MICROELECTRONICS SEMI

74HCT4053D PHILIPS

RG515-02T1K8 VITROHM

2.32E+11 PHILIPS

CFS1/4LT52R112J KOA

MCC224-22IO1 IXYS CORPORATION

HM20100P2 FOXCONN ELECTRONICS

VCR4N SILICONIX

5000272481 MOLEX

IDT74FCT138ATP IDT

WLNFN0068936 OTHER

SK450M0010B5S-1320 YAGEO

700384647 OTHER

1N4729A FAIRCHILD

SS-6446S-A-PGFLS-BA-50 STEWART CONNECTOR SYSTEMS

4816P-002-333 BOURNS

100096-1 AMP

DE09S565MT FRAMATOME CONNECTORS

CRCW06031690F100RT1 VISHAY

SFR255%4K3 VISHAY

S891C225MA1 NICHICON

ADSP-2183BSTZ-115 ANALOG DEVICES

MIC2145BMM MICREL

2.32E+11 PHILIPS

74HC4538D NXP SEMICONDUCTORS

A6250V1PS16B+ EM MICROELECTRONICS

C0603JRNPO9BN101 YAGEO

UJA1065TW/3V3 NXP SEMICONDUCTORS

ISPPAC20-01TI LATTICE

DMP2123L-7 DIODES INC.

MC78L12ACD ON SEMICONDUCTOR

PEX8618-BA50BC PLX TECHNOLOGY

527R-03LF INTEGRATED CIRCUIT SYSTEMS

BAS40-05E6327 INFINEON

E121SD1AV2L8E C&K

PI49FCT3807HE PERICOM SEMICONDUCTOR CORP

TB62757FPGOEL TOSHIBA

RSB12JS2T2R ROHM

TPS63020DSJT TEXAS INSTRUMENTS

LM4927SD/NOPB NATIONAL SEMICONDUCTOR

15-44-3230 MOLEX

EP3C5F256C8N ALTERA

42CTQ030STRR INTERNATIONAL RECTIFIER

B39389-K3953-M100 EPCOS

ES1J OTHER

SN74AHCT1G08DBVT TEXAS INSTRUMENTS

MTSW-150-11-S-D-640 SAMTEC

WLAVA32994-02/01 OTHER

MN864502 PANASONIC

TLP4597G(F) TOSHIBA

IRF6622TRPBF INTERNATIONAL RECTIFIER

93AA86/SN MICROCHIP

QSMC-A435-ZA0M1 AVAGO TECHNOLOGIES

ROV10-471K RAYCHEM

TAJB475K025R AVX

FQH140N10 FAIRCHILD

MF1/4DLT52R2261F KOA

OPA4350UA BURR-BROWN

PCT2.225BK NEMCO

CRCW12064R70FKEA0C VISHAY

1N4148WS-7-F DIODES INC.

TPS62200DBVT TEXAS INSTRUMENTS

RG82845G(SL6PR) INTEL

CNY173SD FAIRCHILD

FQT4N25TF FAIRCHILD

ECUV1H1R5CCN MATSUSHITA ELECTRONIC

LR2512-R20FW WELWYN

DS89C21TMX/NOPB NATIONAL SEMICONDUCTOR

MAX4117ESA MAXIM

AC5520-SLGMU INTEL

AQY275AX MATSUSHITA ELECTRONIC

SAK-C164CI-LM INFINEON