Lonworks Communications - Siemens Moore 353 User Manual

UM353-1

5.0 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.
.
Option Board A-1
LONWorks Communications
node y
Model 352P, 353 or 354 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 configurations
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.
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Model 352P only: the Option 3 I/O Jumper must also be used to select LonWorks.
March 2003
MPU Controller Board
12
. These function blocks, which are detailed in
LonWorks Communications
Twisted Wire Network
.
node 1
node 15
.
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