TVM 2.1-50-220/300-w1-220/380自动化
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2.3 输入输出单元
过程输入输出单元(i/o单元)是完成与现场信号的连接、对输入信号进行的采集与转换、对输出信号进行限幅等处理的智能单元。模块采用智能化设计和看门狗定时、多级隔离、自动诊断、输出回馈以及系统故障时输出自动切换到安全状态等可靠性措施。
过程输入输出单元根据功能分为模入、模出、开入、开出和脉冲量处理、回路控制几类。其中模入、模出单元可冗余配置,以保证重要信号能得到可靠处理。
单元采用模块化结构,通常由模块主体和底座两部分组成。模块主体由外壳和内部模板组成,一般有两块板,一块为cpu板,另一块为i/o处理板。
底座为无源底板,起连接信号、固定模块主体、并为模块主体供电等作用。
3 硬件系统性能分析
3.1中央处理单元负荷
对现场控制站cpu和操作员站的cpu负荷率一般采用实测结果,采用这种体系结构可以保证在满配置的繁忙工况下的现场控制站负荷率低于60%,操作站负荷率低于40%。
3.2 电源负荷分析
每个过程i/o模块采用了低功耗设计技术(如尽量采用低功耗的cmos集成电路、低电压供电等),使每个现场控制站机柜在满配置的情况下,总的电源消耗不超过50%。每个i/o模块的额定输入功率小于2w。在满配置时,机柜容量为50个i/o模块,总电源功耗为200w(=2w×50个i/o模块+50w×2个冗余主控模块),电源模块的输出功率为450w,电源的负荷为44.4%(=200w/450w)。本计算是针对单电源模块时i/o站机柜满配置的计算结果。
3.3 内存和外存余量分析
本系统现场控制站配34m内存,实际占用2.5mb,余量为92.6%;现场控制站不需要外存;操作员站内存和外存余量大于50%;服务器内存为256mb,实际使用8~16mb,余量大于93%;外存一般配20g硬盘,实际使用小于1g,余量大于90%。
3.4 网络负荷分析
(1) 控制网络负荷分析。控制网络采用profibus-dp协议,profibus-dp采用轮巡的传输协议,假设一个系统有n个dp设备,通讯时系统主站首先对#1从站(#1dp设备)发出一个请求,#1从站根据请求返回数据,接着主站对#2从站发出一个请求,#2从站根据请求返回数据……,主站对#n从站发出一个请求,#n从站根据请求返回数据,主站对#1从站(#1dp设备)发出一个请求,#1从站根据请求返回数据……。系统一直不停的轮巡所有设备。
我们考虑系统轮巡一遍设备所用的时间,系统可配置成八种通讯速率,我们按照1.5mbps进行分析:
每秒钟通讯字节数
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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、
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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。
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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。
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14:工业机器人系统备件。
15: 英维斯(TRICONEX):TRICON DCS的系列,如:3805E
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