ABL 2REM24065H
日期:2018-8-11PLC 控制系统的抗干扰能力是关系到整个控制系统安全运行的关键因素之一,而接地系统是PLC安装和应用过程中的重要环节。针对PLC控制系统中存在的干扰问题,重点探讨了系统接地类型、方式及接地装置。实际结果表明,采取良好的接地措施,对提高PLC控制系统的抗干扰能力。
引言
随着国民经济的快速增长,国家智能电网计划建设更多高参数、大容量的燃煤火电机组,以满足不断增长的电能需求。高参数、大容量燃煤火电机组的辅助PLC控制系统的控制结构和控制范围发生了巨大的变化,因此,对控制系统的可靠性要求更为严格。
PLC系统的抗干扰能力已越来越受到人们的重视。合理、可靠的系统接地是提高控制系统抗干扰能力的重要保证。为了保证PLC控制系统的监测控制精度和安全、可靠运行,必须从设计、设备的选型和安装、调试、生产维护各个环节对PLC控制系统的接地进行控制。本文就多个PLC控制系统现场实际应用的情况,探讨了如何通过完善PLC控制系统的接地来提高系统的抗干扰能力,从而实现系统的安全运行。
一、干扰的产生
PLC控制系统应用现场的干扰源种类繁多,尤其是大型电厂更为复杂。干扰的来源主要包括以下几个部分。
①PLC控制系统内部
PLC 控制系统内部干扰源主要有元器件的固有噪声、电源系统等。
②PLC控制系统外部
PLC控制系统外部干扰源主要有闪电、雷击、电气设备的电磁场、电火花等。
③PLC控制系统和周围其他系统的电位差等
在PLC控制系统和周围其他系统的电位差等干扰中,有些干扰源有规律可循,可以通过一定的手段检测并加以控制;有些干扰源则随机出现,难以捕捉。但各种干扰源都是通过一定的途径对控制系统产生影响的,这些干扰途径主要是以“路”或“场”的形式出现。
1.1 “路”的干扰
“路”的干扰是指干扰通过电路(主要是控制系统的过程通道或电源系统)进入PLC控制系统。A/D、D/A转换设备和各种输入装置都有可能成为各种干扰的通路。另外,过程通道和PC计算机之间的公共地线也会成为干扰通路。
“路”的干扰分为串模干扰和共模干扰。
串模干扰是指干扰信号叠加在输入信号上的一种干扰方式。这种干扰信号的特点是它与输入信号串联,存在于同一个回路中,并且全部施加在接收被测信号设备的输入端。干扰信号可能是信号源内部产生的,如图1(a)所示;也可能是由导线感应进来的,
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【主营产品】
1:Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
2:Invensys Triconex: 冗余容错控制系统、基于三重模件冗余(TMR)结构的最现代化的容错控制器。
3:Westinghouse(西屋): OVATION系统、WDPF系统、WEStation系统备件。
4:Rockwell Allen-Bradley: Reliance瑞恩、SLC500/1747/1746、MicroLogix/1761/1763/1762/1766/1764、
CompactLogix/1769/1768、Logix5000/1756/1789/1794/1760/1788、PLC-5/1771/1785等。
5:Schneider Modicon(施耐德莫迪康):Quantum 140系列处理器、控制卡、电源模块等。
6:ABB:工业机器人备件DSQC系列、Bailey INFI 90等。
7:Siemens(西门子):Siemens MOORE, Siemens Simatic C1,Siemens数控系统等。
8:Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
9:XYCOM:I/O 、VME板和处理器等。
10:GE FANUC(GE发那科):模块、卡件、驱动器等各类备件。
11:Yaskawa(安川):伺服控制器、伺服马达、伺服驱动器。
12:Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
13:Woodward(伍德沃德):SPC阀位控制器、PEAK150数字控制器。
14:工业机器人系统备件。
15: 英维斯(TRICONEX):TRICON DCS的系列,如:3805E
另外还有 雅马哈(YAMAHA), 贝加莱(B&R), 欧姆龙(OMRON), KEBA, 安川(YASKAWA) 等品牌的停产备件。
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ALLEN BRADLEY IMC-S/214-F
OKUMA D8-A-11/7.5KW
ALLEN BRADLEY 8520-AA6
ALLEN BRADLEY 1336-C030-EOF
INTEGRAL TECHNOLOGIES 3378-00400
INTEGRAL TECHNOLOGIES 3378-00480
SEMIKRON SKIM429GD17E4HD-2PACK (Surplus New In factory packaging)
ACCURAY 83883-004
FORNEY 35539501 (Surplus New In factory packaging)
AMK AMKASYN-AN-60F-1-1
ITD EMT86-4R6
FANUC A05B-2308-C307 (Surplus New not in factory packaging)
WESTINGHOUSE 4D33816G01
IMPULSE 460AFD3-G (Surplus New In factory packaging)
CONTROL CONCEPTS 3869-097-300-131VDC-R0/10V-I0/10V
GENERAL ELECTRIC DS3800NMEC1G1G
AMK DS5-5-6-SBO-4000-B5
FANUC A06B-6047-H201 (Surplus New not in factory packaging)
SIEMENS 6SE9-212-0DA40
HONEYWELL 14006096-400502
ALLEN BRADLEY 1326AB-B520E-S2K5L
ALLEN BRADLEY 140U-L3D3-D40 (Surplus New In factory packaging)
SICK OPTIC ELECTRONIC PLS101-312 (Surplus New In factory packaging)
WESTINGHOUSE A200M4CXM
DOLAN JENNER SS7B481MDO
MODICON MM-PMA1-400C
GIDDINGS & LEWIS MOTION CNTRL M.1018.3035
ALLEN BRADLEY 1336-B025-EDF-FA2-L3
KEYENCE CORP LK-H022K (Surplus New In factory packaging)
MCK TELECOMMUNICATIONS E-GWY2-SLM24 (Surplus New In factory packaging)
VICKERS 123AL00275A (Surplus New In factory packaging)
TECHNOTRANS 420.29.4500
WESTINGHOUSE DS416-1200A-LSIG
GENERAL ELECTRIC DS3800NMEC1B1A
ITE SIEMENS HJD63B300L (Surplus New In factory packaging)
XYCOM 3515-01L214103501X
SICK OPTIC ELECTRONIC LUT1-400
WEST INSTRUMENTS M-3800 (Surplus New not in factory packaging)
BALDOR RELIANCE DPS43 (Surplus New In factory packaging)
SIEMENS 6ES7-414-2XG02-0AB0 (Surplus New In factory packaging)
MODICON AS-521P-111 (Surplus New In factory packaging)
BALDOR RELIANCE 45C-312 (Surplus New not in factory packaging)
BALDOR RELIANCE 20FN4042
YOKOGAWA DX2010-3-4-2/A1/M1/USB1/MC1
WESTINGHOUSE 1D77547G01
ALLEN BRADLEY 6177R-M3PXP (Surplus New In factory packaging)
SIEMENS 6SN1-123-1AA00-0EA2
METASYS MS-NAE3510-1
ASEA BROWN BOVERI 57160001-ACX (Surplus New not in factory packaging)
BALDOR RELIANCE 86466-76R (Surplus New In factory packaging)
CUTLER HAMMER SVX050A1-4A1B1
NORTHSTAR TECHNOLOGIES R8-1200-L-E68-2-R-C (Surplus New In factory packaging)
HONEYWELL Q7055A-1007
GENERAL ELECTRIC DS3800NPSE (Surplus New not in factory packaging)
TAYLOR ELECTRONICS 6026BZ10400G (Surplus New In factory packaging)
SYMAX 8030-RIM-125S
SIEMENS 6SN1-111-0AA01-2FA0
INDRAMAT MAC112B-2-LD-4-C/130-A-0/W1520LV/S005 (Surplus New not in factory packa
SIEMENS 6SE9-214-0DA40
CUTLER HAMMER 1785T-PMPP-1700
FISHER ROSEMOUNT 12B7625X012
ALLEN BRADLEY 1336E-MC2-SP31B
TOSHIBA VT130G3U-4330
TAMAGAWA 3HAC-17484-10/00
YASKAWA ELECTRIC SGDH-50DE
GE FANUC IC3600EPSY1E
YASKAWA ELECTRIC USAFED-13CA2
GE FANUC IC3600EPSY1A
FANUC A06B-0512-B504
INDRAMAT MHD090B-035-NP0-UN
BALDOR RELIANCE 086466-60W (Surplus New In factory packaging)