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FEC控制器接线概要1
* All information in a BACnet system is represented in terms of objects. An object is an abstract concept which allows us to talk about and organize information relating to physical inputs and and outputs, as well as non-physical concepts like software, or calculations. Objects may represent single physical “points”, or logical groupings or collections of points which perform a specific function. * Although there are thousands of potentially useful object types which might be found in building automation, BACnet defines 23 standard object types in some detail. A BACnet standard object is one whose behavior, in terms of which properties it provides and what they do, is defined in the BACnet standard. This set of standard objects represents much of the functionality found in typical building automation and controls systems today. BACnet devices are only required to implement the Device object. Other objects are included as appropriate to the device’s functions. * * * The major distinction between the two ways that BACnet can work over an IP internet can be summarized as follows: In IP message tunneling, the BACnet devices dont know, or need to know, anything at all about IP. In BACnet/IP, each BACnet device is actually a full-fledged IP node, complete with its own IP address and IP protocol stack. * * * * * * * * * * * * * * * * | Confidential and Proprietary | Confidential and Proprietary 一、协议规定内容: 信息及格式 互联方式选择 (LANs, WANs, Dial-up, etc.) 如何连接不同网络从而形成一个 internetworks 第一章 BACnet协议概述 | Confidential and Proprietary Objects(对象) 对象可代表物理输入、输出点及软件程序 每个对象由一组属性来描述它的行为或管理它的运行 72 第一章 BACnet协议概述 1、信息及格式 Object_Name SPACE TEMP Object_Type ANALOG INPUT Present_Value 72.3 Status_Flags Normal, Out-of-Service High_Limit 78.0 Low_Limit 68.0 | Confidential and Proprietary BACnet 定义了 23 个标准对象 Binary Input Binary Output Binary Value Analog Input Analog Output Analog Value Multi-state Input Multi-state Output Calendar Notification Class Command File Program
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