DS200RTBAG2AFB通用电气模块
LONWORKS通信将选项板A-1添加到控制器以扩展I/O容量。董事会使用LonWorks通信
通过单双绞线网络与远程LonWorks设备通信的协议。图表显示：选项板添加到MPU控制器板和远程安装的LonWorks节点。LonWorks远程I/O板使用自由拓扑收发器，以78.1 Kbps通信。
最多可将十五（15）个物理节点连接到控制器。
首先将所有节点连接到网络，安装LonWorks网络。下一步，临时连接基于PC的使用Echelon公司生产的SLTA（串行链路通话适配器）将网络管理器连接到网络
网络管理器（MetaVision 3.0）和SLTA包含在LonWorks启动工具包中。然后，每个单独的节点由网络管理器安装并保存在项目文件中。项目文件是网络安装的永久记录，必须保留以备将来进行任何网络维护。当
首先安装节点，网络管理器读取程序ID和神经元ID（每个LonWorks设备都有包含全球唯一ID的神经元芯片）。如果以前没有具有相同程序ID的节点安装后，它将从节点读取所有自文档。网络管理器现在将有一个所有该节点内的可用参数和I/O变量。可能需要配置某些参数，但对于对于大多数应用程序，默认设置是可以接受的。然后使用网络管理器绑定网络变量（即将i/O变量从一个节点连接到另一个节点）。
从远程节点到控制器的网络变量连接通过以下方式在控制器内使用：单个环路配置中的LonWorks I/O功能块12。这些功能块在本手册的“功能块”部分允许将网络变量连接到其他块控制器内的输入。有许多不同的块类型可用。块选择取决于要连接的变量类型。
西门子支持LonWorks标准网络变量类型：
•模拟输入和输出的SNVT_lev_percent
•离散输入和输出的SNVT_lev_disc
•SNVT_state，用于西门子16通道离散输入或输出模块，固件1.30或更高
每个网络限制有15个节点。当控制器应用程序需要大量I/O计数时，请使用物理
具有较高I/O计数的节点，以最小化所需的物理节点数量。例如，西门子提供
16通道离散输入和输出模块。在控制器配置中，每个控制器最多可使用六个。A 4-还提供通道模拟输入模块和2通道模拟输出模块。服务考虑
LonWorks网络的功能可能受到以下因素的影响：
•升级MPU控制器板固件
•用具有不同固件版本的板替换控制器的MPU控制器板
•将LonWorks板移动到具有不同MPU控制器板固件版本的控制器
LONWORKS COMMUNICATIONS
Option board A-1 is added to a controller to expand the I/O capacity. The board uses the LonWorks communication
protocol to communicate with remote LonWorks devices over a single twisted pair network. The diagram shows
the option board added to an MPU Controller board and remote mounted LonWorks nodes.
A LonWorks Remote I/O board uses a Free Topology transceiver communicating at 78.1 Kbps.
Up to fifteen (15) physical nodes can be connected to a controller.
Install a LonWorks network by first wiring all the nodes to the network. Next, temporarily connect a PC-based
Network Manager to the network using a SLTA (Serial Link Talk Adapter) manufactured by Echelon Corp. The
Network Manager (MetaVision 3.0) and the SLTA are included in the LonWorks Startup Kit.
Each individual node is then installed by the Network Manager and saved in a Project file. The Project file is a
permanent record of the network installation and must be retained for any future network maintenance. When a
node is first installed, the Network Manager reads the Program ID and the Neuron ID (every LonWorks device has
a Neuron chip that contains a worldwide unique ID). If a node with the same Program ID had not been previously
installed, it will read all of the self-documentation from the node. The Network Manager will now have a list of all
the available parameters and I/O variables within that node. Some parameters may need to be configured, but for
most applications, the default settings are acceptable. The Network Manager is then used to BIND network
variables (i.e. connect I/O variables from one node to another).
Network variable connections from remote nodes to the controller are used within the controller by selecting
LonWorks I/O function blocks within individual loop configurations12. These function blocks, which are detailed in
the Function Blocks section of this manual, enable connections to network variables to be made to other block
inputs within the controller. There are a number of different block types available. Block selection depends on the
types of variables to be connected. Siemens supports LonWorks Standard Network Variable Types:
• SNVT_lev_percent for analog inputs and outputs
• SNVT_lev_disc for discrete inputs and outputs
• SNVT_state for use with the Siemens 16-channel discrete input or output modules available with firmware 1.30
or higher
There is a 15 node per network limit. When large I/O counts are needed for a controller application, use physical
nodes with higher I/O counts to minimize the number of physical nodes required. For example, Siemens provides
16-channel discrete input and output modules. Up to six of each can be used within a controller configuration. A 4-
channel analog input module and a 2-channel analog output module are also available. SERVICING CONSIDERATIONS
The functioning of a LonWorks network can be affected by:
• Upgrading the MPU Controller board firmware
• Replacing a controller’s MPU Controller board with a board having a different firmware version
• Moving a LonWorks board to a controller with a different MPU Controller board firmware version
