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Managing the address table in a Lonworks device

Issue

Managing the address table in a Lonworks device

Environment

LONworks

Cause

A LONworks device contains an Address Table which will hold a maximum of 15 addresses. Once this table is full, all bindings will only be able to use the broadcast setting which is not desirable.

Resolution

​When you create a binding in LonWorks, you decide its behavior by selecting a binding profile. You either select a binding profile, or you use the default profile.

There are basically three types of binding profiles:

  • Acknowledged profiles

  • Unacknowledged profiles

  • Broadcast profiles

Using an Acknowledged profile, will consume one of the 15 available address table addresses on both the sending and the recieving device. The Unacknowledged profiles will only use one Address on the sending device's address table. Broadcast binds do not use an address, but are not recommended. 

Use an acknowledged binding profile when the sending device should receive an acknowledgement from the receiving device indicating that the value of the bound variable was successfully sent.

Binding profile

Transmit timer

Retry count

Acknowledged Profile

96 ms

3

Acknowledged ,  Tx tmr 256,  3 retries

256 ms

3

Acknowledged ,  Tx tmr 256, 5 retries

256 ms

5

Acknowledged  , Tx tmr 1024, 5 retries

1024 ms

5

 
Tip Tip

Be careful of creating large, acknowledged fan-out bindings because they generate a lot of traffic, especially if the device of one of the recipients is offline.

 

 

Use an unacknowledged binding profile when the sending device should not receive an acknowledgement from the receiving device. Use this type when the value being sent is not critical and is of low importance to the control logic.

Binding profile

Repeat timer

Repeat count

Unacknowledged Profile

 

0

Unacknowledged Repeated Profile

48 ms

3

Unacknowledged Repeated ,  5 repeats

48 ms

5

Use a broadcast profile when you do not want to use up an entry in the address table. The device address table has 15 available entries for bindings but the first entry is a reserved broadcast entry that all broadcast bindings can share.

Binding profile

Repeat timer

Repeat count

Broadcast Profile

 

0

Broadcast Profile, 5 repeats

48 ms

5

If no binding profile is selected, a default profile is used:

  • Point-to-point bindings use the Acknowledged profile as default.

  • Fan-out bindings use the Unacknowledged Repeated profile as default.

  • Building Operation uses the broadcast profile as default when the device address table has run out of entries.

If a point-to-point binding is changed to a fan-out binding, the binding profile is automatically updated to an Unacknowledged Repeated profile.

If a fan-out binding is changed to a point-to-point binding, the binding profile is automatically updated to an Acknowledged profile.

 

This and other information about lon bindings is available on the online help guide. 

For Details on the way to edit bindings click here

For More information on the different tables used by each lon device, click here.

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Version history
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Last update:
2 weeks ago
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