建筑智能化BAC_1(概述).ppt

1、Enabling the Future!,A Data Communication Protocol for Building Automation and Control Networks,Manager, Utilities Department Computer Section Past-Chairman, ASHRAE SSPC 135, 1987-2000 Member, ISO TC 205 WG 3, Building Control System Design Chairman of the BACnet XML working group,H. Michael Newman,

2、Steven T. Bushby,Leader, Mechanical Systems and Controls Group, Building and Fire Research Laboratory Post-Chairman, ASHRAE SSPC 135, 2000-2004.6 Convenor, ISO TC 205 WG 3, Building Control System Design,William O. Swan,III of Novar Controls (Alerton),new Chairman of SSPC 135, 2004.6 - Present,Presi

3、dent, BMA President/CEO, Cimetrics Inc.,James M. Lee,BACnet was translated into Korean and adopted as a Korean national standard, KS X6909, in January, 2000.,BACnet has been translated into Japanese by the Institute of Electrical Installation Engineers of Japan,BACnet has been translated into Chines

4、e and was presented at the Intelligent Building Conference in Beijing in December, 2000,Over 15,000 systems are installed today world-wide in 82 countries and on all continents. About 500 involve multiple vendors. Data are from BMA.,典型应用,the Sandra Day OConnor U.S. Courthouse in Phoenix,the Lloyd D.

5、 George U.S. Courthouse in LasVegas,根据OOA&D的方法，利用对象(Object)的基本概念来表示楼宇自控系统的基本单元： （1）硬件二进制输入/输出值。如继电器的状态值。 （2）硬件模拟输入/输出值。如温度的测量值。 （3）软件二进制/模拟值。如控制参数的设定值。 （4）字符串。如报警信息的显示内容。 （5）时间计划表信息。如上、下班时刻楼宇自控设备的动作。 （6）报警和事件信息。如事件通告。 （7）文件。如程序文件，趋势记录文件，历史文件。,Multi-state Input,Multi-state Output,Multi-state Value,Li

6、fe Safety Zone,Life Safety Point,BACnet defines a collection of 23 standard objects,编 码 1. 作用 将信息表示为无二义性的二进制数码 2. 方法 为了减少复杂性，BACnet标准采用混合的编码方法，即利用ASN.1标准描述应用层报文结构，头部控制部分(PCI)采用固定编码，数据部分(UD)采用“ASN.1基本编码标准”进行编码,一致性声明 (Protocol Implementation Conformance Statement, PICS) 由于协议是抽象的，实现是具体的。为了使不同的实现实体能互操作，

7、就必须定义不同实现实体具有的基本特征和功能，由此形成协议的PICS内容。 原标准采用“类别(Conformance Class)和功能组(Function Group)”的方式进行描述。标准定义了6 个一致性类和13个功能组。 后来采用了“ASHRAE Guideline 13-2000 Specifying Direction Digital Control Systems”方法，于是形成以“BACnet互操作基本块(BACnet Interoperability Building Block, BIBB) ”为基本单元的描述方式。,互操作简化说明方法 为了简化系统描述和设计的复杂性，BACnet又定义了6类标准设备： 1. BACnet Operator Workstation (B-OWS) 2. BACnet Building Controller (B-BC) 3. BACnet Advanced Application Controller (B-AAC) 4. BACnet Application Specific Controller (B-ASC) 5. BACnet Smart Actuator (B-SA) 6. BACnet S