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2711P-T12C4D8 /A触摸屏
2711P-T12C4D8 /A触摸屏
2711P-T12C4D8 /A触摸屏
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 。
3.3 硬件滤波及软件抗干扰措施
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。
4、正确选择接地点,完善接地系统
发电厂控制系统的接地对控制系统抗干扰尤为重要,接地方式的好坏将直接影响控制系统的性能。接地的目的通常有两个,其一为了,其二是为了抑制干扰。完善的接地系统是控制系统抗电磁干扰的重要措施之一。系统接地方式有:浮地方式、直接接地方式和电容接地三种方式。
4.1 PLC 控制系统接地:
PLC 控制系统它属高速低电平控制装置,应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响,装置之间的信号交换频率一般都低于 1MHz,所以 PLC 控制系统接地线采用一点接地和串联一点接地方式。集中布置的 PLC 系统适于并联一点接地方式,各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大,应采用串联一点接地方式。
用一根大截面铜母线(或绝缘电缆)连接各装置的柜体中心接地点,然后将接地母线直接连接接地极。接地线采用截面大于 22mm2 的铜导线,总母线使用截面大于 60mm2 的铜排。接地极的接地电阻小于 2?,接地埋在距建筑物 10 ~ 15m 远处,且 PLC 系统接地点与强电设备接地点相距 10m 以上。信号源接地时,屏蔽层应在信号侧接地;不接地时,应在PLC侧接地;信号线中间有接头时,屏蔽层应牢固连接并进行绝缘处理,要避免多点接地;多个测点信号的屏蔽双绞线与多芯对绞总屏电缆连接时,各屏蔽层应相互连接好,并经绝缘处理。选择适当的接地处单点接点。在 PLC 控制系统中,具有多种形式的“地”,主要有:
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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。
EUROTHERM DRIVES 955L8R32 USPP 955L8R32
EUROTHERM DRIVES 590C07009 USPP 590C07009
EUROTHERM DRIVES 690+0015/460/1BN NSFP 69000154601BN
EUROTHERM DRIVES 955L8R22 USPP 955L8R22
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Eurotherm 590+ DC Drive 590P/0035/500/0011/UK/AN 35A
EUROTHERM DRIVES 690+0010B/460/1BN NSFP 6900010B4601BN
EUROTHERM DRIVES 546-035-9-8-1-175-1010-1-00 USPP 54603
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Main Control Board for Eurotherm drive P/N AH470372U002
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EUROTHERM DRIVES LA356248 USPP LA356248
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Eurotherm SSD DC drive
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Eurotherm SSD DC drive, #2
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EUROTHERM DRIVES 514C DC DRIVE PRODUCT MANUAL HA463296
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637/K-D6R06-7 stand-alone EUROTHERM Drive module