Chapter 8 Network variable bindings

targets can be either input NVs or output NVs, depending on the shape of the binding. For a one-to-one binding, the hub/target model loses its meaning, and either side of the binding could be the hub or the target.

The Rover service tool does not indicate the shape or the type of the binding. It is up to you to look at the binding summary and determine the shape. Figure 72 and Figure 73 show examples of a three-member fan-out binding and a three-member fan-in binding as they would look in Rover. Notice that the hub variable is repeated for each target variable.

Figure 72. Rover's view of a fan-out binding

Figure 73. Rover's view of a fan-in binding

Address table

A device’s address table resides in non-volatile memory. The address table serves several functions. Its main purpose is to hold the network (DSN) or group addresses of the devices that will receive outgoing binding data.

Subnet/node bindings use DSN destinations in the sending device’s corresponding address table entries. Group bindings use group address destinations in the sending device’s corresponding address table entries. Another purpose of the address table is to define group membership for receiving devices. This allows a receiving device in a group binding to know that it is a member of a given group so that it can accept or reject bound message packets accordingly. A LonWorks device can be a member of up to 15 groups, a limit that is directly associated with the size of the address table. The limit of 15 address table entries will be a constraint when designing bindings.

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BAS-APG001-EN

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Trane BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit Address table, Rovers view of a fan-out binding
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BAS-APG001-EN, Engineered Smoke Control System for Tracer Summit specifications

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