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How many LonWorks devices can be installed under a Xenta Server

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How many LonWorks devices can be installed under a Xenta Server

Picard Product_Support
‎2018-09-07 06:38 AM

Last Updated: Administrator CraigEl Administrator ‎2023-07-18 09:08 PM

Issue

  • LonWorks point count recommendation for the Xenta 5/7/9xx series controllers
  • What is the device limitation on the FT-10 LonWorks channel installed on a Xenta Server

Product Line

TAC Vista

Environment

  • Xenta 500
  • Xenta 700
  • Xenta 900

Cause

The load point table can be found in Vista version Release Notes on The Exchange Download Center.

When Xenta 700 was released the Product Announcement had a table with the recommended number of LonWorks devices attached to Xenta 5/7/9xx. Below you can see a small revision of the recommendations. The list applies to devices which the applications in the Xenta 5/7/9xx are interchanging data with. Other devices that are completely handled by TAC Vista through the LTA port of Xenta 5/7/9xx are not included in this calculation. These devices will influence the LonWorks network performance in a similar way as if they were connected through a Xenta 911 and have to be considered.

Not following the design recommendations and adding too many LonWorks devices to a single channel will cause poor Xenta Server performance.

Resolution

Each device uses "load points" according to the table. As a general guideline the total "load points" on the network shall stay under 100 to get a reasonable performance. In reality the e.g. intensity of the traffic also has an influence as well as, of course, the expectations on response time.

Type of device Load points
I/O module 5
Xenta group master 280/300/401      20
Additional Xenta 280/300/401      in the group 2
Standard LonWorks device, including Xenta 100, polled 2
Standard LonWorks device, including Xenta 100, bound 0.75

Refer to The Exchange Download Center for future releases of Vista / Xenta Release Notes containing software and updated load calculations

This information is usually found in the Appendix B - Engineer Information, and look for section titled

LonWorks recommendation for the Xenta 500 and 700 series

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