LTE telegrams via couplers and IP routers - Basic Documentation - RMK770-1

Communication via the KNX bus

Product Family
Synco
Product Group
Air conditioning controller
Content Language
English
Content Type
Basic Documentation
Status
Valid
Date
2013-04-08
Document No
CE1P3127en
Download ID
A6V10088170
Stock No.
BPZ:RMK770-1
Product No.
RMK770-1

Recommendation

When using Siemens area/line couplers and IP routers together with Synco devices, we recommend to configure no more than 15 devices with the same zone (e.g. heat distribution zone) and the same zone address (see the addresses highlighted in green in Section 8.2.2).

Notes

The reason for this recommendation is that the area/line couplers and IP routers have limited buffers.

The aim is to prevent transmission of too many LTE telegrams (e.g. heat demand signals from more than 15 devices) in the same cycle.

If it is possible in a given plant to ensure that only a small number of LTE telegrams is transmitted in the same cycle or that the telegrams are short, it is acceptable to configure more than 15 devices with the same zone and zone address. However, observing the recommendation ensures reliable data communication at all times.

The "Block all" filter setting prevents all data communication via the area/line couplers and IP routers. In this case, the recommendation can be ignored.

Zones

The above recommendation does not apply to all zones, only to those listed below (see table in Section 8.2.2).

  • Geographical zones

  • Heat distribution zones

  • Refrigeration distribution zones

  • DHW zone

  • Air distribution zone

  • Boiler sequencing zone

Network with
RX… room controllers

The recommendation on the previous page is particularly important with regard to a network with a large number of RX… room controllers.

In a line containing up to 62 RX… room controllers, an RMB795B central control unit is used as "collector". The area/line couplers are set to "Normal (route)".

The heating and refrigeration distribution zone in each RX… room controller is configured with a zone address in range 1...15 (data communication within the line).

The heating and refrigeration distribution zone in each RX… room controller is configured on the consumer side with a zone address in range 16...13 (data communication via area/line coupler).

The heating/refrigeration demand from the RX… room controllers is transmitted by the "collector" to the RMH primary heating and RMU primary refrigeration controllers.

LTE filter table: 1) Normal (route), 2) Route all, 3) Block all