Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

BACnet Networking Guide

193 views

Published on

  • Be the first to comment

  • Be the first to like this

BACnet Networking Guide

  1. 1. F-27360 MicroNet BACnet Wiring and Networking Practices Guide 2-1 Chapter 2 Networking Practices Introduction to BACnet In BACnet systems, BACnet devices use BACnet objects to share data. To allow this sharing of data, a BACnet network must be properly configured. On a properly configured network, the BACnet protocol carries these data and uses Ethernet®, Internet Protocol (IP), and Master Slave Token Passing (MS/TP) for network communication. At the device level, MS/TP network trunks connect individual BACnet compliant controllers. Architecture Overview Introduction As implemented in an I/A Series MicroNet BACnetwork, the BACnet architecture uses one or more networking protocols to allow communication among controllers and engineering tools. At the device level, Master Slave Token Passing (MS/TP) networks can be used to connect up to 127 unitary or VAV controllers and MS/TP tools to a Plant Controller. With 127 devices connected to a Plant Controller, all 128 MS/TP addresses on the Plant Controller are used. Similarly, up to 31 devices (unitary, VAV, Plant Controller, or MS/TP tools) can be connected to each of the two network trunks of a UNC 510-2. Multiple BACnet MS/TP networks can be connected by networking the Plant Controllers and UNCs using BACnet over IP or BACnet over Ethernet. This is referred to as a BACnet internetwork. In such a configuration, the Plant Controllers and/or UNCs manage communication throughout the internetwork and serve as routers. Engineering tools can be used to manage controllers throughout an internetwork by connecting them to an MS/TP network trunk or by connecting to the IP network. Figure-2.1 shows a BACnet internetwork comprising four or five individual networks. There are thee individual MS/TP network trunks, each managed by a UNC or Plant controller and running individual BACnet devices. Ethernet or IP can be used as the networking technology for the backbone, adding a fourth network. If appropriate for the installation, both Ethernet and IP can be used on the network backbone. This would add a fifth network to the internetwork as shown in Figure–2.1.

×